Hi guys, just did decat(4-2-1) and s flow muffler on a campro iafm manual without touching the stock midbox and piping..

As a result I feel a loss of power and torque and a weird noise with CEL on even after reset.is this a result of lost back pressure due to the stock midbox?

This post has been edited by yOuNg$tEr: Jan 10 2015, 12:07 AM