Straight pipe performance - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 12-05-2012, 09:39 AM Thread Starter
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Straight pipe performance

I recently bought a 1995 5spd Powerstroke with stock everything except window tint. I didnt like the lack of sound so i immediatly got it 4" straight-piped. My question is am i losing low end performance? Do i need a muffler to get better low end power? Also as a new owner with a basically stock truck except a TS 6 position chip and a 4" straight pipe side-out, what can i add for more "bolt on" power?
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post #2 of 11 Old 12-05-2012, 09:43 AM
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Did you get rid of the factory down pipe when you put the straight pipe in? Also look into the 6637 air filter mod

95 f250 eclb 4x4 under construction
96 f250 eclb 4x4 rosewood stage 1 injectors, bully dog 6 position chip, 6637 air filter, idm mod
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post #3 of 11 Old 12-05-2012, 09:58 AM Thread Starter
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no i have the factory downpipe still equipped. how much is a bigger one and is it an easy install? and i will check out the air filter.
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post #4 of 11 Old 12-05-2012, 10:02 AM
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I would go with a diamond eye down pipe they are around 100. They can be a little bit of a pain to install you will need to cut the old one in half to get it out and bend the pinch weld on the fire wall down to clear it.

95 f250 eclb 4x4 under construction
96 f250 eclb 4x4 rosewood stage 1 injectors, bully dog 6 position chip, 6637 air filter, idm mod
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post #5 of 11 Old 12-05-2012, 10:09 AM Thread Starter
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ok thanks i will look into that. does riff raff produce a decent 6637?
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post #6 of 11 Old 12-09-2012, 09:26 PM
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I put a Riffraff 6637 filter system on this summer. It is easy to install and well built. I also put on the filter sock. love the sound of the turbo. Great setup. Let me know if youhave any questions on it.
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post #7 of 11 Old 12-09-2012, 09:45 PM
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You do not need a muffler at all. It will not affect low end performance. It is a turbocharged engine, so the more flow, the better.

Have you ever looked at your stock downpipe? It is flattened out like a pancake and is very restrictive. Get rid of that thing and get an aftermarket one.

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post #8 of 11 Old 12-10-2012, 04:19 AM
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When you decide to upgrade the factory pancake downpipe, find a scissor jack and use it to push your firewall in a little bit. This will save you a ton of time and frustration.
I spent quite some time trying to fit my diamond eye DP in there and it was not going to fit, but as soon as i used the scissor jack and moved the firewall it fit just fine.
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post #9 of 11 Old 12-10-2012, 09:52 AM
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6637 intake, diamond eye down pipe will help you get what your after, then try tunes like TW, DP, and several others, good luck, i got my down pipe from cptrucks.com $100 shipped to my door

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2000 Excursion 7.3 4x4 246k
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The stock downpipe in an OBS is flat because I'm a ginger.
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post #10 of 11 Old 12-10-2012, 12:54 PM
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Look into aero turbine mufflers if you want even less back pressure after you do the down pipe an get some good custom tunes

1997 F250 7.3 powerstroke SCLB HD XLT
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35"X12" BFG KM2's
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1996 ECLB XLT SOLD
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