TOZ

I was reving my engine witht cutout opne last night and I heard this rattling noise after reving, I did the same thing on my other LS1 and did the same thing and got underneat to check it out but i don`t see anything loose.
What can it be ?

SouthFL.02.SS

One of many things like...

-If you have cats, they could be coming apart inside.
-Some part of your exhaust hitting something like the tunnel brace.
-The band clamp at your Y to I pipe merge.

Rubber mallet time.

Tally TransAm

iTrader: (17)

could be a loose heat sheild

TOZ

I got this from a friend : "is it after you let off the gas? If so, I was told that the "rattling noise" is caused by the immediate lack of backpressure, and air going in the cutout instead of out."
Do you think this could be happening ?

SouthFL.02.SS

Does your friend wear his cap sideways?

I doubt that's the problem.

TOZ

Well he does wear a cap

NBM2001z28

iTrader: (43)

its turbulance, from the weld on the cut-out. or at least thats what i've been told. it does it on mine too.

etperformance

It is most likely rubbing on the rear heat shield at the rear. Mine did this too, I just put a pry bar under to push up on the heat shield.

wild thing

iTrader: (2)

Mine did this too when i used to have a cut-out, i have heard many problems about that so i think its normal thats one reason i got rid of mine too

BlackWS602

Every LS1 cutout I've heard did this. Mine did it, all my friends did it.

TOZ

Well I got the car on the lift with a muffler guy. And the result was turbulance.
Air going back in inside the cutout after reving. There was nothing loose or close to the entire pipe tuching or vibrating. It is normal at least for the LS1s to do this. My other LS1 does the same thing and it has the same set up.
Thanks for all of them that tryed help me figure this out.
Danny