Pretty rarely when I start my car I get a fairly loud backfire I have JBA shorties and SLP LM exhaust. Im pretty concerned thanks for any help !

Tcarswell

 

Well I have open JBA shorties and Ive started the ls1 up a bunch of times so far and havent had any backfires...im no expert on this kind of thing but I wouldnt think the shorties would be causin the backfires...

 

Hmmm wonder what the hell it is then Its been tuned up lately...

 

I think it's the LM. My buddy has one on his TA and it backfires until it warms up. He has stock headers though.

 

I mean like backfires though like a starting gun for a swimming meet ... Not like a nice healthy muscle car popping

 

It's the loudmouth! I've had it pop really loud without having any aftermarket headers. The loudmouth resonator can really get your exhaust to pop really loud. That would be my guess

 

Ok , so no big deal ?

 

Mine would pop ,like a firecracker sound when punched with the stock manifolds too. With the longtubes its really loud whenever it does it but I think it sounds cool. I read somewhere it has to do with fuel that was not burnt and doesn't hurt it,

 

not to say that this would have anything to do with the backfiring you are experiencing, but what kind of spark plugs do you have and how long have you had them?

I have experience the high pitched bang with my exhaust and then I changed my spark plugs to the #12 ACDelco Rapidfire, then no more back firing. If you are using the OEM sparkplugs, then the might be worn to the point of not combusting the fuel properly.

 

no big deal, I had popping noises with loudmouth also.

 

You could always check for:
1) improper tuning
2) exhaust leaks (possibly at the heads)

I don't know what you should be expecting it to sound like with that exhaust...