Thread: flanging from 2.5 inch downpipe to 3 inch exhaust?

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  1. #1 flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GTP Level Member 2000GTP's Avatar
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    I want to buy a 3 inch catback, and it has a 3 inch flange to hook up to the downpipe. i plan to get headers later on when i get the money... but for now does anyone sell a flange that gos from 2.5 inch to 3 inch so i could bolt up this catback? I want to keep the catbacks 3 inch flange, and have the downpipes 2.5 open up to a 3 inch exit.
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  2. #2 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GrandPrix Junkie Sabrewings's Avatar
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    The flanges are physically the same size, so they'll bolt up. One will just have a larger opening.
    2004 Impala LS - got some mods sold!!!
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    NAIOA moderator Still Imp'n, just in a different Imp.
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  3. #3 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    DUI BABY Bio248's Avatar
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    why have a 3" exhaust? it is fairly useless.
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  4. #4 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GTP Level Member 2000GTP's Avatar
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    Quote Originally Posted by Bio248 View Post
    why have a 3" exhaust? it is fairly useless.
    just because its a zzp catback... and i love the way it sounds.. i know its really no big deal preformance wise
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  5. #5 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GTP Level Member 2000GTP's Avatar
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    hmm, just emailed zzp... they said it would not fit the stock downpipe
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  6. #6 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GT Level Member a3gtp's Avatar
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    Quote Originally Posted by 2000GTP View Post
    hmm, just emailed zzp... they said it would not fit the stock downpipe
    I have talked to ZZP personally about this situation for my friends car:

    They will, for an additional $20 weld a 2.5" to 3" adapter onto their catback for you so it'll bolt onto your 2.5" exit D/P. I have no opinion on the idea just thought I'd tell you
    If they catch you in the back seat trying to pick her locks they're gonna send you back to mother in a cardboard box.
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  7. #7 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GTP Level Member 2000GTP's Avatar
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    Quote Originally Posted by a3gtp View Post
    I have talked to ZZP personally about this situation for my friends car:

    They will, for an additional $20 weld a 2.5" to 3" adapter onto their catback for you so it'll bolt onto your 2.5" exit D/P. I have no opinion on the idea just thought I'd tell you
    yea... only problem is sending them in my downpipe... my car is a daily driver :/
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  8. #8 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
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    take it to an exhaust shop for an estimate
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  9. #9 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GTP Level Member 2000GTP's Avatar
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    yea, because the thing is im getting a sick deal i think. i might be buying one for 400 bucks plus shipping used for about 2000 miles. I could buy it new for like 750. im trying to figure out if i should do i can do this stuff or not before i go ahead and buy it becasue my plan originally was to get it when i got headers later on
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  10. #10 Re: flanging from 2.5 inch downpipe to 3 inch exhaust? 
    GT Level Member a3gtp's Avatar
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    Quote Originally Posted by 2000GTP View Post
    yea... only problem is sending them in my downpipe... my car is a daily driver :/
    I meant the reducer flange is welded onto the catback so it bolts onto your stock d/p
    If they catch you in the back seat trying to pick her locks they're gonna send you back to mother in a cardboard box.
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