JPCrazyLegs

iTrader: (1)

Hey guys, I just got my cutout installed when I have it open for some reason under WOT every time it redlines and as soon as it shifts (a4) I get a loud BRAP/pop/backfire type noise. It does not do in when I rev it up in neutral, or any other time. The noise does not happen with my stock exhaust when i close the cutout so I dont think its a missfire or anything. Anyone know what this annoying *** noise is? Heatsheild getting hit with a sudden blast of exhaust maybe? I don't hear it in any LS1 WOT cutout videos. Any input would be great, maybe this is just something normal as a lack of backpressure.

dre2013

iTrader: (7)

sounds like your trans might be slipping, making you hit the rev limiter

spy2520

iTrader: (3)

mine did it. Never hurt anything i dont think. Periodically, like once a month or two months, it would let out a very loud blast through the cutout, i dont know if that **** was normal, but pops during shifting or coasting arent that abnormal for a cutout, especially if your tune isnt spot on.

JPCrazyLegs

iTrader: (1)

Nah my trans is def not slipping, its an exhaust noise and it does not happen when i have the cutout closed. Plus I only have 30,000 miles on my car haha. I think its because right as it shifts, there is a temporary lack of backpressure and it makes that noise or something.

not7fifteen

iTrader: (8)

That sounds feasable to me... My old 99 Z28 did that all the time at the track with the cut out open too, mainly from 1-2nd

jarednut4ever

iTrader: (14)

It TM pulling out timing during the shift. It's normal. Only way to get rid of it is to get a tune.

JPCrazyLegs

iTrader: (1)

Aha! That would make sense why it only does it in the lower shifts and not like on the highway. Thanks man.