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Aug 13, 2008 | 02:45 PM

bumpin_records

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From: chicago

pt91.5

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.

Aug 13, 2008 | 02:54 PM

Mr.MartyStone

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From: Screwston, TX

If it were easy everone would do it. Seriously though if you can make it work i would run the biggest DP available.

Nate

Aug 13, 2008 | 03:17 PM

Hennytime

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From: winter springs, fl

supposedly bmrs turbo k member will fit a 5" dp no problem

Aug 13, 2008 | 03:24 PM

98transguy

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From: new hudson,mi

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"

Aug 13, 2008 | 03:40 PM

smokinHawk

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From: Columbus, ohio

4" will probably be ok.
allot of big power cars run a 4"

Aug 13, 2008 | 04:22 PM

blown454ss

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From: omaha ne

Quote:

Originally Posted by smokinHawk

4" will probably be ok.
allot of big power cars run a 4"

agreed

Aug 13, 2008 | 05:11 PM

bumpin_records

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thanks all im gonna sit back and think this one out

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Aug 13, 2008 | 07:06 PM

veee8

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From: Raleigh,North Carolina

I have a 5" with a PA k-member and Spohn solid mounts. Runs down the passenger side along block, dumps behind front tire.

Aug 13, 2008 | 08:37 PM

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bumpin_records

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i have the Spohn k-member and solid mounts. it just look like its gonna be a little tight.

Aug 14, 2008 | 10:11 AM

#11

Pro Stock John

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From: Chicago, IL

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.

Aug 14, 2008 | 11:03 AM

#12

veee8

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From: Raleigh,North Carolina

Quote:

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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