my bandit

iTrader: (10)

i just installed my slp loudmouth system (without y pipe) and ever since then i have been noticing that it pops whenever it is revving down and i dont know if i need to worry about this or not

Disturbed Bird

iTrader: (9)

well i know on the lt1 cars with the factory y has a flat spot in it that cause the popping. so i guess its the same with the ls1's.

i never had a ls1 with the factory y

my bandit

iTrader: (10)

the ls1's do also
see i dont know if its that but i might be getting a new one soon or if its that the car is cold bc it still does it when its up to temp but not as bad

Dave 96TA

iTrader: (10)

It's a combination of the lack of backpressure from not having a muffler and the flatter y-pipe on the driver side for clearance. My LT1 popped less after I got headers and a nice y-pipe.

ErikElvis

iTrader: (1)

Popping and gurgling when revving down is more or less normal.

Carter01

iTrader: (11)

Nothing to worry about except the sound. Sometimes the tips you are running can cause the popping sound to increase or decrease. With my old 95 TA i changed from the 2 split style tips on each side to a single opening tip on each side and it helped to reduce the popping.

orangeapeel

iTrader: (18)

It is the firing order unfortunately and the resonance of the AL block that magnifies that sound.

themack56

iTrader: (70)

my car dose the popping as well, with the slp loud mouth, nothing to worry about

orangeapeel

iTrader: (18)

having an open exhaust with a resonator style muffler, i.e: loudmouth, will also amplify the already existing effects.

Revelation Z28

iTrader: (10)

its normal.

flowmasters amplify it though

silverLSWON

iTrader: (16)

my dad has stock manifolds and y, loudmouth with CME and it pops like crazy when cold. when it warms up its not as bad but it's damn annoying. when my buddy got headers and an ory, the noise went away on his car. i picked up an slp y pipe for my dads car so hopefully it helps