#13584 - 09/11/08 07:55 PM
2.5" or 3" down pipe?
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Registered: 08/30/08
Posts: 148
Loc: Holyoke, MA
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I just finished installing my very first mod on my 2001 GTP; a WizAired CAI w/K&N. The next thing I want to get is a ZZP catted down pipe. Should I get the 2.5" or 3" version? My car has an unknown aftermarket 2.5" cat-back that was on the car when I bought it. I plan on getting colder plugs, an overkill PCM, some sort of scanner, and dropping to a 3.4" pulley in the future. I'm leaning towards the 3"...
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01 GTP
Headers, modified 1.9's, 3.4 mps, Overkill pcm, and a bunch of other little goodies.
Near future: Gen V, N*, XP, and all supporting mods...
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#13585 - 09/11/08 08:27 PM
Re: 2.5" or 3" down pipe?
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Registered: 09/27/07
Posts: 1575
Loc: Where Dorthy,Toto & Wicked Wit...
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3" for sure with the mods you plan. Don't forget a 180 T-stat.
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator
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#13586 - 09/11/08 08:28 PM
Re: 2.5" or 3" down pipe?
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Registered: 08/30/08
Posts: 148
Loc: Holyoke, MA
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Thanks. Already got a drilled 180* stat that I'm going to be installing when I flush my radiator this weekend.
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01 GTP
Headers, modified 1.9's, 3.4 mps, Overkill pcm, and a bunch of other little goodies.
Near future: Gen V, N*, XP, and all supporting mods...
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#13587 - 09/12/08 01:17 AM
Re: 2.5" or 3" down pipe?
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Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
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3".
until you have to get rid of it because you decide you want headers.
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Corey Smith 
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#13588 - 09/12/08 06:16 AM
Re: 2.5" or 3" down pipe?
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Registered: 02/08/04
Posts: 3463
Loc: Gonzales Tx.
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#13589 - 09/12/08 10:23 AM
Re: 2.5" or 3" down pipe?
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Registered: 08/30/08
Posts: 148
Loc: Holyoke, MA
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Originally posted by ordonez1307:
3".
until you have to get rid of it because you decide you want headers. Why would I have to get rid of it if I decide to get headers? Would there be any benefit of getting headers to go along with the mods I mentioned above? Thanks
_________________________
01 GTP
Headers, modified 1.9's, 3.4 mps, Overkill pcm, and a bunch of other little goodies.
Near future: Gen V, N*, XP, and all supporting mods...
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#13590 - 09/12/08 10:51 AM
Re: 2.5" or 3" down pipe?
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Registered: 01/01/08
Posts: 3900
Loc: Ontario, Canada
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if you only plan on doing a 3.4 pulley then plog and a 3" dp will be fine.
headers come with their own downpipe so the 3" dp you buy you won't be able to use.
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#13591 - 09/12/08 12:50 PM
Re: 2.5" or 3" down pipe?
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Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
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Originally posted by CB9050: Originally posted by ordonez1307:
[b] 3".
until you have to get rid of it because you decide you want headers. the mod bug bites hard. You'll be intercooling and dropping pulleys before you know it
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Corey Smith
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#13592 - 11/08/08 10:17 AM
Re: 2.5" or 3" down pipe?
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Registered: 09/01/06
Posts: 282
Loc: New York
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im buying a DP used on CLUB GP wold i need to buy anything like gaskets and what not to install or no?
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1998 grand prix GTP BBS rims Borla exhaust K&N cold air intake lowerd FAST 
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#13593 - 11/08/08 10:37 AM
Re: 2.5" or 3" down pipe?
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Registered: 09/01/06
Posts: 282
Loc: New York
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o and will a 3 inch DP fit if my car is lowerd?
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1998 grand prix GTP BBS rims Borla exhaust K&N cold air intake lowerd FAST
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#13594 - 11/08/08 01:53 PM
Re: 2.5" or 3" down pipe?
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Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
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yes, it will fit.
Youre going to need the gaskets, yes.
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Corey Smith
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#13595 - 11/08/08 05:06 PM
Re: 2.5" or 3" down pipe?
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Registered: 11/17/07
Posts: 175
Loc: Jax, Fl
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You should definitely get the 3in. Ive already ordered mine and I should have it on Tuesday.
But Ive heard of people having to put header wrap on the zzp flex section because it whistled. How often does this occur? Should I wrap mine before I install it
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#13597 - 11/08/08 06:45 PM
Re: 2.5" or 3" down pipe?
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Registered: 11/17/07
Posts: 175
Loc: Jax, Fl
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Originally posted by HercMan:
Get the three inch. If you ever do get headers you can always sell the 3" DP.
Only thing I'll add in is flip your sway bar. That's where you'll end up with clearance issues. What happens is it may look like it's far enough away but when you get on the throttle and the engine rocks it smacks the DP against the sway bar and in turn induces false KR. even the stock sway bar? And what do you think about wrapping the downpipe
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