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03-05-2008
Originally Posted by IndeedSS
If you look into the opening of the stock DP, you will understand why the ZZP DP is less restrictive. Also with the ZZP DP you don't need a ubend delete. The 2.5 DP is plenty for a NA.
***************its not n/a its a gtp!!!! sorry!!!*******************
03-05-2008
let me clarify....
basicly since the exhaust tube sizes are the same between the stock exhaust and the zzp downpipe the only real difference is that i will no longer have a cat or u-bend...is that worth the reduced level of kr(if any) / the increased hp and or tq and the money spent for these inprovements??
03-05-2008
the stock DP is still more restrictive than the zzp... use what you bought, you wont regret it.
03-05-2008
sorry man I deleted that post right after I made it. I guess you were faster at the quoting than I was at deleting.
and I agree with Toasty
Last edited by IndeedSS; 03-05-2008 at 08:00 PM.
03-05-2008
yea when i posted it i was like wtf?...then i said oh he must have realized it was a gtp i was talking about...lol but it's cool...i appreciate the reply's guys and im glad u all convienced me not to return it(or just made me realize what was best)..i hate going through the hassell of returning crap to where i bought it lol...im going to put it on now so i hope i can maybe tell somewhat of a difference...we will see
03-05-2008
I'll refrain from ranting on this, but it is ridiculous how much 3" DPs are pushed onto people. I've got a 2.5" DP on my GTP and I got that on purpose. By the time a 2.5" is going to hold you back, you are in header territory. I personally think a 3" DP is useless. The stock exhaust is routed pretty bad anyway, the DP band aid can only do so much. 2.5" will help you keep low rpm part throttle response, and won't make any appreciable difference at higher RPMs. The 2.5" DP is also cheaper and you don't have to worry about flipping your sway bar. And I am not the only one who feels a 2.5" is just fine for a GTP. From Overkill's website:
"Which size is right for my vehicle?
We recommend 2 1/2" downpipes for most vehicles. If you have a GT, you'll retain your torque better. On any vehicle however, supercharged included, that is keeping the less restrictive factory cat-back exhaust or has a 2 1/2" aftermarket system, the 2 1/2" will compliment its flow better...A 2 1/2" downpipe with Powerlog will support bolt-on vehicles idealy." Emphasis added.
When comparing a stock DP with an aftermarket, you also need to keep in mind that the stock is double walled and has barely a 2" ID. So yeah, feel good about keeping it.
03-05-2008
WOW!!!
So i went and installed like i said...
I had presoaked everything in pb blaster stuff and man i must of made about 80 1 inch turns on each of the two bolts that connected to the rear header lol....Damn tight spaces!!....so anyway i popped it out and put the new one on and started it up...let it sit for a second and heat up the exhaust so it could bond the gaskets to the mating surfaces(just in case to help prevent a blow out in the gasket)....
So anyway im driving and i decide to get on it from a stop and i noticed right away it spun the tires a little longer than normal....then i got on it from about a 30mph roll and was on it while going about 80...i was recalling what it felt like (pulling wise) to when it was suppose to shift into second and im like....ok its about to shift...look down and its only at 4500rpm's...
so in other words it was pulling like it was at 5500 before the dp install...but now it starts pulling the same at like 4500-5500.
conclusion: Money well spent!!! noticeable gains!!!
But yea now that i think about it it is pointless to have the 3''dp if you are leaving the rest at 2/ 1/2''....but just wanted to check with my buddies first lol...and by the way with o2 sensor unplugged no ses light has come on yet...drove for about 30 mins...o well even if it does my tuner will be here monday so ..problem solved!!!
later fellas
03-06-2008
Glad you are happy with your purchase. Sounds like it was well worth the 160 turns of the wrench to get the old one off.
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