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ahesq · 07-19-2013, 04:34 AM

Wondering why the ZL1 owner switched from the NPP GM dual mode to the corsa? I am having issues with my NPP GM mufflers (weird resonance at 3000 rpm and wire stuffing coming out of them). Let me know.

The Corsa set up for the ZL1 is 3 inch pipe. That's why they specifically state it will NOT fit the convertibles (because of the bracing). The Corsa set up for the SS is 2.5 inches, so it will fit the convertibles with no modifications. However, the SS corsa 2.5 inch version is not Quad tip, like the GM NPP dual mode.

Good news is that you can buy spacers for the rear cross braces (where they meet the trunk), and a new front brace to accomodate the 3 inch pipe. Check out Phastek Performance's website and then the bracing kit for the "Stainless works" 3 inch system.

07-19-2013, 04:34 AM	#14
ahesq Drives: 2014 C7, 3LT, manual Join Date: Apr 2013 Location: Maryland Posts: 20	Wondering why the ZL1 owner switched from the NPP GM dual mode to the corsa? I am having issues with my NPP GM mufflers (weird resonance at 3000 rpm and wire stuffing coming out of them). Let me know. The Corsa set up for the ZL1 is 3 inch pipe. That's why they specifically state it will NOT fit the convertibles (because of the bracing). The Corsa set up for the SS is 2.5 inches, so it will fit the convertibles with no modifications. However, the SS corsa 2.5 inch version is not Quad tip, like the GM NPP dual mode. Good news is that you can buy spacers for the rear cross braces (where they meet the trunk), and a new front brace to accomodate the 3 inch pipe. Check out Phastek Performance's website and then the bracing kit for the "Stainless works" 3 inch system.