I emailed SLP about a loud mouth or an adapter/install kit for third gens and this is what they said

Thank you for your interest in SLP Performance Parts.

Although a Third-Gen "Loud Mouth" adapter is not currently on our list
of
upcoming products, we will certainly consider developing one if
consumer
interest proves sufficiently strong.

Thanks again for your interest.

Regards,

Team SLP PP

 

I'd most likely be interested.

 

It is not that diffucult to make any 4th gen cat-back work. In fact I believe there have been some recent threads about guys who had to do almost no fab work to get their loudmouth to fit.

 

I am planning to get the loudmouth in the spring. I have been doing alot of reading and it doesn't seem like its going to take much fabrication.

 

Im also getting a loud mouth and I know it doesn't take much to install a 4th gen exhaust to a third gen but it will be that much easier if someone has done all the fabrication for you plus you won't have to have it done at an exhaust shop one of the better exhaust shop by my house said it would be $60 to $100 on top of the install price if they have to fab up any brackets/hangers which I think is a little much

 

I just got my Loudmouth installed last Friday, the guy did it for $75(he does alot of work for our shop though) Anyway, it didn't take him long at all, and he said the pipe to mate the cat-catback was fairly simple to do. It sounds friggin awesome..for those of you thinking about getting it...do it, you won't be sorry Only thing, is get the single tips, I opted for the dual tips, but the outlets are cut at different lengths to match the curve of the 4thgen rear bumpers.