Quote:
Originally Posted by Baddawg53
I have heads/cam/LT's, borla atak with NPP. To get under track limits I added the borla resonator and the stock NON NPP muffler. I'm sure I'm sacrificing a few horsepower, but it's definitely under the 103 limit and I'm confident bit will be under 95. Trust me, ditch the NPP and go stock non NPP ... It dropped 25+ db revving in my driveway.
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I really want to retain some of the NPP function. But we’ll see. after a lot of reading I ordered a magnaflow x-pipe muffler. I think it may do the trick.
https://www.carid.com/magnaflow/stai...vD_BwE#reviews