Exhaust advice
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New User
Joined: Jul 2013
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Exhaust advice
I just got a 95 crew Obs and wanted to improve air flow. Is it good to have no cat and muffler and people telling me three inch down pipe then four inch all the way back from there is it safe to run it all open like that.
Lead Driver
Joined: Oct 2010
Posts: 5,131
Likes: 45
From: Columbus, Oh
Yes. Many of us run straight pipes. 3" DP to 4" straight will sound and perform great.
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
Yep, 6637 from Riffraff.....Riffraff Diesel: RDP 6637 Filter Kit
Posting Guru
Joined: Oct 2011
Posts: 1,647
Likes: 1
From: Exton, PA
Yep, 6637 from Riffraff.....Riffraff Diesel: RDP 6637 Filter Kit
my exhaust is 3" DP to 4" straight pipe through a 4" ID straight through muffler with a 45 degree bend and straight pipe out in front of the passenger side tire. the muffler is only there because its required by PA law - its not really doing anything though as intentially installed it with the louvers pointing the wrong way :-) the turbo whistle is still great and power is noticeably increased over the 3.5" straight pipe system what was on this truck when i bought it.
and, in turn that 3" DP to 3.5" system was much better than the stock crush tube to 3.5" w/ cat, no muffler straight pipe system on my old truck.
Logistics Pro
Joined: Mar 2007
Posts: 4,579
Likes: 837
From: knoxville, tn
I would recommend to not worry about an intercooler. It sounds like you are just getting started putting mods on your truck. There are several things to spend money on before worrying about an intercooler unless you are pulling very heavy loads all the time. An intercooler does not give you any more measureable horsepower, it does cool the air so that the exhaust gas is cooler helping to keep your truck running cooler when under heavy load. So unless you are pulling more than 12k for long periods of time then I would not worry about it.
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Lead Driver
Joined: Oct 2010
Posts: 5,131
Likes: 45
From: Columbus, Oh
I would recommend to not worry about an intercooler. It sounds like you are just getting started putting mods on your truck. There are several things to spend money on before worrying about an intercooler unless you are pulling very heavy loads all the time. An intercooler does not give you any more measureable horsepower, it does cool the air so that the exhaust gas is cooler helping to keep your truck running cooler when under heavy load. So unless you are pulling more than 12k for long periods of time then I would not worry about it.
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