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Alpha1BC · 06-08-2016, 09:46 PM

From my research, it looks like an NPP muffler can bolt on to a non-NPP exhaust if welding or using clamps. No bolted joints for just axle back, need to cut and re-attach. However, there's a little more to it than just bolting it up.

1) The wiring harness for the NPP actuators isn't on non-NPP cars, or at least I can't find it on mine). Would need to wire up your own controller or switch for manual control (easier), or figure out how to wire and reprogram the controllers that control the NPP from the factory (not easy and probably not possible without help from a dealer).

2) There are other valves in the non-NPP exhaust that I haven't seen on NPP systems. They're located about 2 feet before the muffler on the mid-pipe. Not 100% sure what those valves are or how they're controlled, but they'll most likely change the sound.

3) You are correct, the rear lower fascia would need to be replaced/cut to allow room for the dual tips on each side instead of the stock single tips.

4) I'm guessing that this isn't a huge concern, but making this change will also void warranties (I'd be really surprised if it didn't, at least).

06-08-2016, 09:46 PM	#3
Alpha1BC Drives: 2017 1SS 1LE Join Date: Jun 2016 Location: Detroit, MI Posts: 1,000	From my research, it looks like an NPP muffler can bolt on to a non-NPP exhaust if welding or using clamps. No bolted joints for just axle back, need to cut and re-attach. However, there's a little more to it than just bolting it up. 1) The wiring harness for the NPP actuators isn't on non-NPP cars, or at least I can't find it on mine). Would need to wire up your own controller or switch for manual control (easier), or figure out how to wire and reprogram the controllers that control the NPP from the factory (not easy and probably not possible without help from a dealer). 2) There are other valves in the non-NPP exhaust that I haven't seen on NPP systems. They're located about 2 feet before the muffler on the mid-pipe. Not 100% sure what those valves are or how they're controlled, but they'll most likely change the sound. 3) You are correct, the rear lower fascia would need to be replaced/cut to allow room for the dual tips on each side instead of the stock single tips. 4) I'm guessing that this isn't a huge concern, but making this change will also void warranties (I'd be really surprised if it didn't, at least). __________________ 2017 SS 1LE.