StevesGT

So I had a local shop make me a copy of SLP loudmouths, and they sound great. But I just drove it after it sat for 6 hours, and it was making an odd 'POP...POP...POP' sound, that went away when it warmed up. It sounded like,....this will sound weird but,..it sounded like if you slap you open hand against your open mouth... It did it for about 2 minutes. I did the exhaust 2 days ago, and this is the first I noticed it. Anyone else here something similar with SLP/knockoff exchaust?

StevesGT

Also noticed today for the first time,....boy, when it is cold and you goose the throttle does it let out some M80 like backfires!

gcotton

I tried that, trust me its not the same as the slp's

ss

I have the SLP brand and they do kind of rumble & gurgle when you let off the gas after stepping on it cold. But never an actual backfire. I like the rumble, but it sounds different than what you are describing.

MikeVistaBlue06

If it is making this sound as you decelerate, you may have a leak in the exhaust system where they connected the SLP LM copies. After driving, the metal expands and seals the leak, then it goes a way.

Just a guess, hope it helps.

Mike