- Reviews
- Questions
- exhaust
- problem
- muffler
- original
- factory exhaust
- power log
- 2005
- Grand Prix
- Installation
- performance increase
Overall worth it
I love the sound and performance of the exaust. Fitment seemed to bretty decent as well, for a prefab. It does hang slightly lower than stock. My only issue is where it splits over to the drivers side, it wants to sag a little bit. There no factory hunger to begin with so there is only so much that can be done.

3" Exhaust Install on 05 Grand Prix
3” exhaust installed on a 2005 Pontiac GTP Grand Prix. Modifications - Reduction pulley, PCM performance tune, front power log, throttle body spacer. Pros: - High quality exhaust. Really nice looking - Easy installation - Noticeable performance increase from factory exhaust Cons: - Mufflers sit a bit lower than factory mufflers - Excessive droning and harmonic vibrations inside the cabin, very annoyng at low RPM. I ended up shelling out another $130 for Car Chemistry Inc 3 disk CC inserts (2.25”). These go into the exhaust behind each muffler. I installed the inserts - as is- without the supplied restrictor and outlet plug caps to fix the dronning and vibration problems. Additional info for general situational awareness: - 2 exhaust hanger O rings - 4 exhaust hanger rubber isolators - O2 extension harness needed - ZZ-38MANGKT -3800 Stock Manifold Gasket (optional- check condition of your original) I replaced mine. - Exhaust hit the metal cage that goes around the gas tank. This can be remedied by bending the exhaust hanger arm or by using a slightly larger exhaust hanger rubber isolator. I used a different rubber isolatorto fix the problem. -Minimal power loss with 3 disk CC inserts.
3" Exhaust Install on 05 Grand Prix
3” exhaust installed on a 2005 Pontiac GTP Grand Prix. Modifications - Reduction pulley, PCM performance tune, front power log, throttle body spacer. Pros: - High quality exhaust. Really nice looking - Easy installation - Noticeable performance increase from factory exhaust Cons: - Mufflers sit a bit lower than factory mufflers - Excessive droning and harmonic vibrations inside the cabin, very annoyng at low RPM. I ended up shelling out another $130 for Car Chemistry Inc 3 disk CC inserts (2.25”). These go into the exhaust behind each muffler. I installed the inserts - as is- without the supplied restrictor and outlet plug caps to fix the dronning and vibration problems. Additional info for general situational awareness: - 2 exhaust hanger O rings - 4 exhaust hanger rubber isolators - O2 extension harness needed - ZZ-38MANGKT -3800 Stock Manifold Gasket (optional- check condition of your original) I replaced mine. - Exhaust hit the metal cage that goes around the gas tank. This can be remedied by bending the exhaust hanger arm or by using a slightly larger exhaust hanger rubber isolator. I used a different rubber isolatorto fix the problem. -Minimal power loss with 3 disk CC inserts.

3800 3” exhaust
This is an awesome exhaust. I bought it to go with the headers I also purchased. Easy to install. All the gaskets and really nice clamps come with it. I bought all new zzp rubber hangers to go with it.

Awesome Exhaust System
Fit in the car really well looks and sounds awesome.