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No offense to any manufacture or owner that wants to "upgrade" the $1,200 exhaust upgrade on the C7. Sounds different, sounds better than factory, I'll give that. Always wondered why an after market manufacture gets more hp torque than all of the General's engineers put together. I granted can see the dyno results posted in different forums, Corvette, BMW, Mustang or whom ever. Even more impressive to me has always been the butt dyno that feels a huge difference "as soon as I drove it". I've yet to see certified 1/4 mile times pre and post exhaust change.. 0-60 mph pre and post change. I've yet to see certified mpg prior and mpg afterwards.

Same concerns for air breathers, plugs or wires.

Anybody provide these certs? If I've offended anyone, apologize, but not sorry at this point.
 

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No offense to any manufacture or owner that wants to "upgrade" the $1,200 exhaust upgrade on the C7. Sounds different, sounds better than factory, I'll give that. Always wondered why an after market manufacture gets more hp torque than all of the General's engineers put together. I granted can see the dyno results posted in different forums, Corvette, BMW, Mustang or whom ever. Even more impressive to me has always been the butt dyno that feels a huge difference "as soon as I drove it". I've yet to see certified 1/4 mile times pre and post exhaust change.. 0-60 mph pre and post change. I've yet to see certified mpg prior and mpg afterwards.

Same concerns for air breathers, plugs or wires.

Anybody provide these certs? If I've offended anyone, apologize, but not sorry at this point.
The factory has to follow strict emissions rules etc. GM can't approve the C7 corvettes to be made with high flow cats. There are no rules to be adhered to in the aftermarket. Some aftermarket exhaust companies for example can sell a system with high flow cats or cat-delete which is meant for track use. They're not going to monitor your driving after you install it. Yes, you can get a ticket if your car is too loud but that's quite rare. When more mods are added in addition to the exhaust, like headers, supercharger, head & cam, etc then the performance gained from the exhaust is more. I agree that spending $2000 for an exhaust by itself is a total waste of money unless you're trying to change the look with different tips like the Callaway system.
 

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As someone who went aftermarket with the C6 and ordered NPP on the C7, it can be a tough choice. The Corsa Xtremes on the C6 sounded amazing, but there were 2 reasons that I went NPP this time. I plan on running with the management turned off all the time which leaves the valves open, but wanted the option to close them if the situation dictated it. The Xtremes (Corsa's most aggressive) could get a touch intrusive within the cabin if you were having a conversation but it was far from being a problem. I just like having the valves open/closed option. The other reason was when the car would be in V4 mode. I figured countless hours were spent by GM engineering to make the car sounded good when in this mode and I just didn't want to gamble with aftermarket. I'm just keeping my fingers crossed that the NPP on the C7 with the valves open will sound somewhat near as good as the C6 Xtremes.
 

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For sure! If you're going aftermarket, Corsa Xtreme is king IMHO.
 
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