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pt91.5

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Old 08-13-2008, 02:45 PM
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Im in the process of making my downpipe and i was wandering if 4" is ok or would that be too small, its just that going witha 5" is gonna be a lot harder to fabricate and run though the kmember tubular and engine.
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Old 08-13-2008, 02:54 PM
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If it were easy everone would do it. Seriously though if you can make it work i would run the biggest DP available.

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Old 08-13-2008, 03:17 PM
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supposedly bmrs turbo k member will fit a 5" dp no problem
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Old 08-13-2008, 03:24 PM
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OFI has a kit that fits a 5" downpipe on passenger side, i am sure u can fit a 5" .Just take the extra time and do the 5"
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Old 08-13-2008, 03:40 PM
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4" will probably be ok.
allot of big power cars run a 4"
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Old 08-13-2008, 04:22 PM
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Originally Posted by smokinHawk
4" will probably be ok.
allot of big power cars run a 4"
agreed
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Old 08-13-2008, 05:11 PM
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thanks all im gonna sit back and think this one out
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Old 08-13-2008, 06:58 PM
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4'' downpipe is good for about 1500hp,anything more needs a 5''
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Old 08-13-2008, 07:06 PM
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I have a 5" with a PA k-member and Spohn solid mounts. Runs down the passenger side along block, dumps behind front tire.
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Old 08-13-2008, 08:37 PM
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i have the Spohn k-member and solid mounts. it just look like its gonna be a little tight.
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Old 08-14-2008, 10:11 AM
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What's your goal? I'd say if it's mid to high 8's I would do a 4" DP seems like that works.
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Old 08-14-2008, 11:03 AM
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Originally Posted by bumpin_records
i have the Spohn k-member and solid mounts. it just look like its gonna be a little tight.
Oh it is tight, but does have plenty of clearance. We laid a section of 5" in there while we fabbed the headers. Thinking ahead on that one! But 5" parts are crazy expensive. Go find out how much mandrel bends and v-bands run!
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