Thread: 2.5" vs 3" downpipe for GT

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  1. #1 2.5" vs 3" downpipe for GT 
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    I have a 2001 grand prix GT that needs a new catalytic converter. ZZP is out of 2.5" downpipes right now, and only the 3" is available. Should I just get the 3" or wiat for 2.5"?(don't really care about the price) Or is the 3" much louder than the 2.5"?
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  2. #2 Re: 2.5" vs 3" downpipe for GT 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Go 3in.

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  3. #3 Re: 2.5" vs 3" downpipe for GT 
    Donating Users EHB's Avatar
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    3 inch and no it won't be any louder
    2000 GTP - 3" Catted DP...ZZP Plog...9" Cone filter...Reptile pcm...3.4 pulley...AL104's
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  4. #4 Re: 2.5" vs 3" downpipe for GT 
    GTP Level Member 99GT2dr's Avatar
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    Why do 2.5" dp's even exist?
    '11 Suburban LTZ
    '99 SSEi
    '99 GT
    '09 G8 GT
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