Reaperchild

1 3/4 headers to 3.5 y pipe all the way to stock cat back ... electric CUTOUT in Y pipe ... plan is to dyno tune with cutout open ...... but need to cruise almost always with a quite exhaust = closed cutout ... what are the bad parts in this proccess ....!!

brian_rs/ss

you should be fine. i have a buddy doing the same thing with no problems.

MikeG

iTrader: (33)

You'll be fine. My car was tuned with the cutout open and I have it closed 99% of the time, no issues.

pHEnomIC

iTrader: (14)

As long as you have your MAF sensor still enabled and working, itll still be accurate.

It might throw off a speed density tune a little but on my car it is only a few percent difference in fueling. Keep your o2s enabled for closed loop, itll be able to adjust even if in speed density mode.

SweetS10V8

iTrader: (4)

So do your dyno tune in the idle/cruize area with the cutout closed, and do the WOT with it open.

Reaperchild

thanks guy's ... tomorrow is the cutout & stock catback install hope to get it tuned out on the same day ... Input Appreciated