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06-27-2009
Been reading on this site and seen a lot of recommendations for a zzp downpipe and magnaflow hi flow cat. Since my prix needs a cat any way i wanted to replace it with some better parts and to make it sound better. Just wondering which downmpipe is a dirrect bolt in and works in these cars
06-27-2009
Yeah the zzp downpipe with high flow cat is a direct bolt in. It will give u a good jump in performance and it will make it sound deeper too
06-28-2009
I have seen quite afew people complain about them leaking shortly after being installed.
06-28-2009
Meh, just skip the cat. Get a 3" Catless Downpipe and listen to the newly found exhaust note and jump in power from getting rid of that factory DP/Clogged Cat/U-Bend
06-28-2009
But if the cat is skipped what about the O2 sensor that follows it? And is it worth deleting the cat? If i need a dummy 02 sensor where is a good place to get one? and will gas millage get worse?
Last edited by Feather Head; 06-28-2009 at 07:37 PM.
06-28-2009
Nope...o2 Simulator. Get one from ZZPerformance. Or if you know anyone with a Tuner around you they can permanently delete the cat code...and if anything you'll get BETTER MPG's without a cat...and you said you wanted it to sound better...it will...just keep the resonator as that is what controls the sound.
06-28-2009
Alright thanks for the information, is it better to keep the stock resonator or put a glass pack in for it and if i decide to change the mufflers in the future what would be a good choice?
06-29-2009
The resonator controls what frequencies are heard in the cabin. The mufflers tune the exterior sound.Originally Posted by bluegtp91
06-29-2009
Keep the Res and go cattless. I have done both catted and cattless and I'll never put another cat back on. More Powah!!!
And try out Hogan Performance. I went from Random Technologies to Hogan Performance and what a difference. I gained 3 tenths in the quarter mile too.
www.3800performance.com or http://www.hoganperformance.com/ is where you can buy their stuff from.
06-29-2009
Not totally true. The resonator is what took care of most if not ALL of the rasp in the exhaust note in my car. It ALSO gets rid of the drone inside the interior...but don't believe me...just watch the videos...all the same setup, first just doesn't have the stock GM Resonator.
Before: Video - xp start up - exhaust gtp
After: YouTube - bluegtp03's Channel
06-29-2009
i dont have a cat, u-bend, or resonator, and i cant even hear my exhaust above 50 mph
this "highway drone" ive heard so much about does not exist
HOWEVER, it is definitely there in the city, i like it though. sounds 1000 times better then all these 4 cylinders with glass packs
06-29-2009
Alright i will go catless for now and see about the res and mufflers. For the downpipe is 3 in better then the 2.5 in is there really a performance difference, this is on a STOCK gt too
Last edited by Feather Head; 06-29-2009 at 05:23 PM.
06-29-2009
You don't know anything about the 3800 exhaust note then.
Most people will say with the N/A motor, a 2.5" Downpipe...BUT...if you plan on modding it the 3" Downpipe will help you down the road...I say 3", but that is just me.
06-29-2009
nope, nothing. thats not my 2001 grand prix gt i drive and listen to everydayYou don't know anything about the 3800 exhaust note then.
06-30-2009
Oh yeah, that's right. Daily Driver. Why didn't you tell me sooner? You don't hear any drone because your deaf from it.
06-30-2009
oh, yes, that must be it.
Last edited by Jakegday; 06-30-2009 at 09:05 AM.
06-30-2009
i hear it on high way and streets...it is a little annoying, but over time you do tune it out.
07-01-2009
Where can i get the simulated O2 sensor, ZZP and W Body Store no longer carry them....
07-01-2009
Not sure...I might have one for sale but I'm not sure yet. I'll let you know though...
07-05-2009
3800performance.com
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