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Old 07-31-2011, 09:20 AM
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Geeto Tiger Geeto Tiger is offline
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Default 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

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Old 08-21-2011, 06:46 AM
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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.

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Old 08-25-2011, 04:53 PM
mrrat1 mrrat1 is offline
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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.

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Old 10-22-2013, 03:55 PM
mrrat1 mrrat1 is offline
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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.

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Old 10-24-2013, 01:59 PM
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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.

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60 Jaguar Mark 2, 3.8L Automatic
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78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
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Old 11-11-2013, 10:59 AM
mrrat1 mrrat1 is offline
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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.

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Old 11-12-2013, 01:44 PM
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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.

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60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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Old 11-18-2013, 04:42 PM
mrrat1 mrrat1 is offline
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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........

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