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Discussion Starter #1
PLEASE DON'T HIJACK THIS THREAD WITH OPINIONS ON WHICH EQUIPMENT YOU BELIEVE IS BETTER (there are plenty of threads on this already)!

Hi all, I'm thinking about adding a supercharger and maybe a new exhaust system on my 2015 C7 with NPP. If you had either/both of these installed on your C7 in North Carolina, whether done by a GM dealer or not, would you mind sharing:

1. who in NC did the installation for you and whether you were pleased with their work?

2. which supercharger, headers and/or exhaust system did you have installed and do you have any regrets regarding any of your choice(s)?

3. whether your new exhaust system (if you did any exhaust upgrade(s)) eliminated your NPP feature?

4. what your before and/or after dyno figures were (if you had any dyno's)?

5. whether you had a supercharger installed by a GM dealer, regardless of brand, and if your dealer indicated that he would still honor the GM warranty after the installation (regardless of whether verbally or in writing)?

Feel free to PM me if you don't want to share any info publicly. Thanks in advance for your time.
 

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Hi jwcater I had a Edelbrock E Force Supercharger installed by National Speed Inn Wilmington NC. They did a good job,car runs great. 537 HP 530 tq at wheel.there pnone number 910-352-5901
 

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Hi again Car dynoded before supercharger was 406 HP 400 tq at wheels. Edelbrock also offers a 3year 36000 mile free warrenty. I hope this answers some of your questons... have a good day
 

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Discussion Starter #5
rabelvett1, thanks for the info. I take it that the Edelbrock warranty is on their product and that your GM engine warranty is not likely to be of much help anymore? Anyone else who would like to respond, please do.
 

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Discussion Starter #6
I heard thats not good for the stock C7 6.2 liter. "new exhaust system" on your NPP?
Just interested in what others may be doing . . . looking at options. Regarding the SC on the normally aspirated C7 engine, I've heard the same but I've also spoken to a couple of guys in my area who've added a supercharger on a normally aspirated C7 and have had no problems for over a year now. May be a time bomb waiting to happen but, for them, so far so good.
 

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I looked into this when I first took my Stingray. I was told multiple times that it would void the warranty on my engine by getting the work done in the shop or going to a performance shop. I decided to not go through with it because of this, I've already had issues with the electronics, tranny, fitment....so voiding the powertrain warranty is something that I definitely won't do!
 

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Discussion Starter #8
I looked into this when I first took my Stingray. I was told multiple times that it would void the warranty on my engine by getting the work done in the shop or going to a performance shop. I decided to not go through with it because of this, I've already had issues with the electronics, tranny, fitment....so voiding the powertrain warranty is something that I definitely won't do!
If I don't move forward my plans to upgrade, it would be for that very reason. Thanks for your input, Ashimar. I would still like to hear more opinions even if it's just more warnings not to go through with my plans.
 

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I suspect that even with a Edelbrock SC if the engine goes south there would be questions as to why. If the bottom end came apart I doubt it would be covered, as Edelbrock would probably say that it was a GM manufacturing defect. If the SC came apart and damaged the engine, they would probably pay for it. I think it would require a mechanically oriented SC failure causing the engine failure for them to pay. Obviously, the GM warranty is completely gone as soon as the SC is installed regardless of SC or installer. If you want to play that game you have to be willing to take the possible consequences. If you are willing to pony up for a new engine if it goes south, then all is well and go for it. If not then you probably shouldn't do it. It's all about how comfortable you are with the possible outcomes both good and bad.
I had a new Toyota Spyder back in 2004 with a 5 year warranty on it. I installed a PPE header on it, a piggyback ECU with plug in harness and then modified and installed a Eaton SC as well with all custom brackets, mounting etc. I had the second SC Spyder in existence, because at that time no one had done an Eaton and only one other guy had done a SC at all and it was the remote mounted turbine style. Did I void my engine warranty, absolutely! Was it a blast, Absolutely! But I figured if I blew up the engine it was only about $4000 to install another one, and I was willing to take that risk. As it was, I never blew anything up, and that car never required any warranty for the five years I owned it. It's all about risk vs. reward and how much of each you are willing to take. The engine in our Corvettes is much more pricey than was in my Spyder. My $.02.
 

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Edelbrock uses a 3rd party insurer for their warranty. The warranty is supposed to cover the components voided from GM due to the installation of the SC. The first company they used went out of business, not sure of the date, and they found another company. If you have an Edelbrock SC I would check to see if the company underwriting your policy is still viable.

The only tuners I am aware of that provide a reliable warranty alternative are Calloway and Lingenfelter. If I were to SC a C7 I would use one of those, I lean towards Lingenfelter.
 

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Option 1.
RPM Motorsports garner NC near Raleigh. rpmmotorsportsnc dot com is the shop that I would trust. I have been recommending Ryan's shop for years. I purchased a 15 Z06 and don't plan on any mods (wife's car). They know what there doing when it comes to GM performance. Talk to them first.

Option 2.
With warranty being a big concern I would contact Hendrick Chevy in Cary NC. Hank is a 30 year veteran and has done tons of SC added. And it's all warren
 

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Option 1.

Option 2.
With warranty being a big concern I would contact Hendrick Chevy in Cary NC. Hank is a 30 year veteran and has done tons of SC added. And it's all warren
Warrantied by whom? It sure as hell isn't GM.
 

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GM warranty will be gone, even the tune required kills off GM Warranty and smog laws

As expected any warranty by supercharger maker is nothing but a 3rd party that the vendor does not even have control over and time
and time again I have seen failures,
the seller, vendor and 3rd party insurance find reasons not to live up to their warranty hype.
In the end each blames the other and car owner gets stuck with replacement costs.

Just 1 example I know of is a 2011 C6 LS3 owner bought a EVS kit,
had it installed, came with a EVS requirement that even the A6 tranny had to be tuned with
the "canned" tuner that came with the kit.

Once tune was flashed in the A6 would not work correctly and within few miles it was broken
I analyzed the engine and tranny tunes to find EVS A6 tune flashed in really was for the A4

Owner took C6 to GM dealer, they found the tune, voided the warranty, the EVS warranty told owner too bad, and did not pay out
Cost owner $3,500 for dealer to fix the damage and GM put a block on VIN # for any further warranty. :(
 

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I'll try to make this clear, to help those interested in a supercharger upgrade. RPM can do it all from cam jobs to a complete package. I suggest taking to the profesionals. I spent 15 years as a master tech and have personally experienced the story like J.R. mentioned. I only turn wrench for enjoyment now. Mail order do it yourself, programer in a box are all bad ideas and can lead you to the same experience.


Don't let this kind of thing scare you from modifying your car. I alway seek out professional that work in the business daily, even with my background.

Now with that said, call the dealer I suggested if warranty and a SC is what you want. Lol, never said it would be a GM warranty.
 

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Discussion Starter #15
I'll try to make this clear, to help those interested in a supercharger upgrade. RPM can do it all from cam jobs to a complete package. I suggest taking to the profesionals. I spent 15 years as a master tech and have personally experienced the story like J.R. mentioned. I only turn wrench for enjoyment now. Mail order do it yourself, programer in a box are all bad ideas and can lead you to the same experience.


Don't let this kind of thing scare you from modifying your car. I alway seek out professional that work in the business daily, even with my background.

Now with that said, call the dealer I suggested if warranty and a SC is what you want. Lol, never said it would be a GM warranty.
Yes, I've heard that there are dealers out there who say they are willing to "take care of you" if you allow their techs to do the install. One dealer that I've spoken to personally made such a statement and I believe he would probably stand behind his offer - to some degree anyway. He seems to have high confidence in his tech(s). I suspect that he may make such offers on a case-by-case basis taking into consideration the driver's age and what he knows about how that person drives his car (leisure or track). After all, he probably wants his customers to be happy and he has his own tolerance for risk/reward. In submitting this post, I just wanted to know, among other things, what forum members had to say regarding their own experiences/opinions with specific upgrades using NC installers since I'm not likely to go out of state to have any work done - not far anyway. Regarding the SC upgrade, I find myself agreeing with greggshere and others that the decision ultimately boils down to tolerance for risk and the potential for reward. I'd still like to continue hearing from those who have not chimed in yet, especially on the other questions I had. Thanks to all those who have responded so far.
 

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I have heard that any type of modification severely affects your resale and trade in value to a dealer. In addition, engine modification messes with sensors. I wouldn't do it unless you are a mechanic or have unlimited resources.
 

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Yes, I've heard that there are dealers out there who say they are willing to "take care of you" if you allow their techs to do the install. One dealer that I've spoken to personally made such a statement and I believe he would probably stand behind his offer - to some degree anyway. He seems to have high confidence in his tech(s). I suspect that he may make such offers on a case-by-case basis taking into consideration the driver's age and what he knows about how that person drives his car (leisure or track). After all, he probably wants his customers to be happy and he has his own tolerance for risk/reward. In submitting this post, I just wanted to know, among other things, what forum members had to say regarding their own experiences/opinions with specific upgrades using NC installers since I'm not likely to go out of state to have any work done - not far anyway. Regarding the SC upgrade, I find myself agreeing with greggshere and others that the decision ultimately boils down to tolerance for risk and the potential for reward. I'd still like to continue hearing from those who have not chimed in yet, especially on the other questions I had. Thanks to all those who have responded so far.
I believe that could occur, and up to recently did occur, were if not for the fact that GM now has a protocol of, on major warranty claims relating to the powertrain, requiring their dealerships to make two specific tests to determine if a motor has been modified BEFORE they will approve a warranty claim. One of those tests includes determining whether any of the computer systems were modified, and the other whether the total power rating has ever been "enhanced" over factory. Can you blaim GM for not wanting to potentially spend between $18K (LT1) and $30K (LT4) on a motor warranty claim, let alone the potential consequent damage the torque tube, transmssion, e diff and more.

Candidly, GM is one of a very few that will not automatically void your warranty if your failure occurred while you were on a race track.

Having said that, we are on this planet once, and if you wish to go for it, that is a personal choice --- YOURS, not anyone else's on the forum. If you choose to do that, with your knowing and being able to afford the possible consequences, GREAT for you!

If I were going to enhance the power of my C7, only two places I would go, e.g., Callaway and Lingenfelter (the same two as mjw930 mentioned).
 

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Personally, I would love a Lingenfelter mod but when I had an M3 and I modified it there were nothing but headaches afterwards.
 

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Discussion Starter #19
I have heard that any type of modification severely affects your resale and trade in value to a dealer. In addition, engine modification messes with sensors. I wouldn't do it unless you are a mechanic or have unlimited resources.
At this point, I had not given that much thought but I should have. I have a Harley that I'm trying to sell and nobody gives a damn that I've added $5k in chrome and performance modifications to it. They want to pay "book value" for a run-of-the-mill stock model despite the fact that I had all the work done at the dealership where I bought the thing. Good point. Thanks for the reminder.
 

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Discussion Starter #20
Personally, I would love a Lingenfelter mod but when I had an M3 and I modified it there were nothing but headaches afterwards.
Did Lingenfelter do the work on your M3?
 
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