[97cavy22]

Originally Posted by njweatherman

I had no problems with the 817746 when I pulled fuse 51 and kept the valves open all the time. However, when I installed 81084 (Scavenger X pipe with afm valves), I did hear a metallic vibration when I initially pulled into a parking spot and there were cars next to me. It only lasted a few seconds and went away. If I can do it again, I would just do the axleback and keep the stock chevy x pipe.

I would hate to spend money on an NPP setup, then have to pull the fuse though. could very well be the AFM vavles causing some of your noise.

[M1nd64m3]

I had the actual valve plate fall off mine and get lodged in the exhaust. Submitted a warranty claim and never heard back. I’d avoid this exhaust.

[njweatherman]

I have noticed that their customer support has gone to crap since Holley took them over.

[OniCamaro]

Originally Posted by Camaro 79

UPDATE - Thanks to a very helpful Youtuber, I was able to find and solve the problem. It was actually the tension spring connected to the NPP Valve (the one that moves while you switch modes). It was too loose, so when it was in stealth mode the spring would rattle around. I fixed this by compressing the spring and putting a ziptie right behind it which completely solved the problem. A very happy ending and I am fired up with my exhaust now!

Anyone have link to the Youtube video OP mentioned? That'll be a massive help. Any long term experience on the zip tie solution? Does it not melt?