Exhaust System for 1998 Grand Prix GTP
 

I am looking to buy a new exhaust system for my GTP, and was wondering what is the best bang for my buck when it comes to these cars? I would rather go stock, but GM parts are much more expensive than aftermarket...and there are so many different options that I am clueless in where I should go/what to buy

Sorry for the late response, but I missed this post. We had the regular SLP exhaust ( not the load mouth system) and I found it a good mix of performance and sound. Just alittle loader than the stock GTP system with a better rumble, and only made load noises above 4000 RPM.

We had it installed with the rest of the GTX Kit when we bought the car, so I do not have direct comparision numbers for the stock system, sorry.

not many choices really........I'll be shopping for one soon! I have a Basani system in the box for my Sliverado SS. They are nicely done, and prob my first choice. Dave K.

Well the time has come for replacement!! The intermediate pipe has holes and bracket broke off of cat.
Looks like I'm going with SLP cat back not much eles out there.

also look into a high flow cat that straightens out the down pipe were the O2 sensor mounts, on our 99 GTP the high flow cat was worth .3 of a second in the 1/4 mile.

Ended up going with the SLP cat back, not the load mouth. Basically sounds stock at higher revs, but has a nice sound at idle and cruise.

That is the same system we had on our 99 GTX, I liked it, good sound and performance not to loud, and was still in good shape after 140,000 miles.

Thanks Jeff, sounds like this system should last us to the end of her trail :)
If I could only keep the low coolant sensor clean........