3" downpipe to 2.5" catback
12-27-2011, 11:08 AM
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3" downpipe to 2.5" catback
Generally speaking will a 3" downpipe bolt to a aftermarket 2.5" catback? Or is this something that will mostly depend on brand.
12-27-2011, 11:34 AM
#3
thats my setup basically. ZZP longtubes 3in dp to a 2.5 mandrel bent back end.
I had zzp just weld a slip reducer to 2.5, and had the opposite end expanded to a ID of 3in and slipped it on and clamped it, and thats all there was to it.
I had zzp just weld a slip reducer to 2.5, and had the opposite end expanded to a ID of 3in and slipped it on and clamped it, and thats all there was to it.
Last edited by 07BoostedG5; 12-27-2011 at 11:41 AM.
12-27-2011, 11:37 AM
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12-27-2011, 11:38 AM
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Do you mean a 3" through-out? That physically isn't possible. You will have to make some sort of flange to make it work. You can get a 3" DP that goes from a 3"-2.5" flange. That will work.
I hope I understood what you were trying to ask and answered your question.
I hope I understood what you were trying to ask and answered your question.
12-27-2011, 02:06 PM
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YES it will work, if the aftermarket cat-back bolts up to your existing stock 2.5" downpipe it'll fit.. order a downpipe from ZZP. I got my ZZp catted 3inch DP with a 2.5" exit flange welded onto it and a extra O2 bung and plug for when i get a wide band! i got mine on black friday and saved 30% tho 
Mine being paired up with a magnaflow 2.5" cat back system
They give you lots of options, 3 inch exhuast exit or 2.5inch bolt on, extra 02 bung for wideband or not, gaskets, catted or not catted. and i believe they use magnaflow catalytic convertors
ZZPerformance - 3 inch Stainless Cobalt/Ion Downpipe #
Mine being paired up with a magnaflow 2.5" cat back systemThey give you lots of options, 3 inch exhuast exit or 2.5inch bolt on, extra 02 bung for wideband or not, gaskets, catted or not catted. and i believe they use magnaflow catalytic convertors
ZZPerformance - 3 inch Stainless Cobalt/Ion Downpipe #
12-27-2011, 07:43 PM
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12-28-2011, 03:00 PM
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i got long tube heads and gutted cat downpipe from vibrant that i hooked up to what i believe is stock 2.5 inch straigh catback... no gapping.. idk if that helps... prob not huh?
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