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Old 04-21-2010, 07:32 AM
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obs downpipe options

whats the obs downpipe options out there? i have a gt38r on a SD pedistal. the turbo has a 4in outlet then necks down to 3in and then back to 4 then to my 5in exhaust. is there anyway to fit a 4in down pipe in there so i can have it just go from 4in to 5in?
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Old 04-21-2010, 08:24 AM
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were there is a will, there is a way !! I would not want to go there myself, the 3" was a PITA, yes It can be done, but I don't know if bending the firewall in enough would work, you may need to cut a section of it out and fab a new sheet metal cupped insert piece. Remember that you need about 1/2" clearance (firewall to pipe) so that you don't have a nasty vibration noise in the cab. this happened to me and I had to take it out and bent the firewall more. Guys on here have done it, maybe someone will chime in with an other idea. Good Luck !!!
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Old 04-21-2010, 08:30 AM
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yea i figured it would take some work. just trying to explore all options.
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Old 04-21-2010, 08:51 AM
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What paydirt described is the reason mine is still stock
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Old 04-21-2010, 09:10 AM
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I have heard to fit a 4" downpipe teh firewall has to be cut out and reshaped to make it fit. Maybe you could fit a 3.5 with beating the firewall up alot.
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Old 04-21-2010, 09:10 AM
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people have put body lifts in and are able to clear a 4incher but Im not a big fan of body lifts. You would have to do some decent modifying of the fire wall to clear a 4inch down pipe because looking at my 3inch one its already really really tight
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Old 04-21-2010, 09:10 AM
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ha. i guess ill have to get creative!!
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Old 04-21-2010, 09:11 AM
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I know a feller on another forum that put a 4" SD down pipe in his OBS and installed a van turbo. He had to do some serious re-shaping of the firewall to make the down pipe fit, and he said if he had to do it over again he wouldn't go there.
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Old 04-21-2010, 02:38 PM
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after talkin to a few of my buddies.. i think ive come up with an idea to get one in there... ill let ya know after i play with the idea some.
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Old 04-21-2010, 03:02 PM
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I dunno if these will show up or not, if not I'll repost them later.











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