Thread: exhaust question

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  1. #1 exhaust question 
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    What do you guys think of this? Trying to make sure what I plan to do will work, if I need anything else, if I'm overlooking anything, etc.

    Right now I have an 01 GTP, and a 98 GTP. The 01 GTP has a stock exhaust, and the 98 GTP is straight piped, just a cat and 12"ish cherry bomb, welded all the way back, (very recently bought it this way).

    I have a set of speed daddy headers with downpipe. I also found someone local selling a ZZP 3" catback (no res/no cat -zzp mufflers), a 2.5" catless/bungless DP(stock), a 3" catless/bungless DP(for catback).

    My goal is to get the 98 to close to stock sound levels, it's stupid loud right now. I eventually want to install the speed daddys in my 01 GTP.
    My thought is to pick up the zzp catback, install that in the 01, and then I will put my stock exhaust into the 98. Will the 01's exhaust bolt right into the 98 no problem? I'm not sure I'm ready to attempt the headers myself, so I might pick up the 3" DP as well for a temporary, so I can just get the catback in the 01 and put the stock into the 98.

    Do you see any problems with doing this?
    2001 Pontiac Grand Prix GT : Stock and slow and SOLD.
    2001 Pontiac Grand Prix GTP Special Edition
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  2. #2 Re: exhaust question 
    Moderator dsmuts's Avatar
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    97-03 exhaust is all the same.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: exhaust question 
    GrandPrix Junkie gtpeddie's Avatar
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    this is my GTP with stock mufflers, ZZP DP and thrush glasspack its hard to get these cars to sound good but its possible that's why i stayed with stock mufflers.


    97 GTP DD, 1952 Ford F-1 Resto Project, 2006 Mustang GT "UnDeR CoNsTrUcTiOn", 02 GPGT SOLD!, 98 GTP Parted/Scraped
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  4. #4 Re: exhaust question 
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    In my 01 if I put a 3" catless dp in, will I throw a code and be getting terrible mpg? Do I need to run an o2 emulator or something?
    2001 Pontiac Grand Prix GT : Stock and slow and SOLD.
    2001 Pontiac Grand Prix GTP Special Edition
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  5. #5 Re: exhaust question 
    GTX Level Member bps02gtp's Avatar
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    Yes u need an emulator. It fools ur pcm into thinkin u have a cat. Or get it tuned and make it think it doesn't exsist
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