4" down pipe install - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 03-07-2008, 05:20 AM Thread Starter
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4" down pipe install

I've had the factory down pipe and gutted cat in place since I bought my truck new. Behind that I've had a 4" straight pipe with a 5" 90 turned out with a 6" tip in front of the rear tire. I purchased a TRUE 4" down pipe and cat delete from RPM outlet for $111.85 shipped to my door. Standard shipping and I had it in 2 days. I installed it last night by myself and it was a real PAIN IN THE AZZ! Finally got the dp in place and it was heck getting both my arms back there for one to hold the downpipe in place and the other to put the clamp on. Got the cat delete in place and tacked it on with the wire welder. Drove down from our shop to my house which isn't but a couple hundred yards and it was rattling like crazy. I went back to the shop this morning and loosened up the dp and wedged a pry bar between the dp and the lip on the firewall, then had to wedge another one between the pipe and the transmission line. AFter that I tightened the clamp back down and now know more rattles. My question is, the dp is touching the up pipe and very close to the transmission line, is this normal? Will the heat be to much? And last but not least, if your thinking of going with a 3.5 or 4" dp, go with the 3.5, It has to be easier. The 4" is in there now and hopefully it won't hurt anything being close to everything, we'll see. I'm off to the muffler shop to get the rest of my exhaust put back on.

Jason
2006 F250 2wd 6.0 psd, 8.96 1/8th mile with canned SCT tunes, now running Spartan Hybrid Race tune! AFE Stage 2 PRO DRY S, 4" turbo back str8 pipe in front of rear tire, auto, crew cab short bed, ZOO DAD mod, 5% tint over the factory tint.
Track Times!
Reaction---.674
60 ft-------1.892
594 ft------8.370
1/8th ET---8.965
1/8th MPH--75.63
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post #2 of 3 Old 03-07-2008, 06:17 PM
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i think you need some space between your up pipes and down pipes. i cant recall but it seems that i have heard of problems of rubbing thru the up pipe. i just did the 4" 2 piece dp from magnaflow and it was a bee-och but fit real nice once in. maybe someone who hasnt enjoyed as many adult beverages as me can chime in and make more sense.
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post #3 of 3 Old 03-07-2008, 07:38 PM Thread Starter
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Well it's in there now, and all welded up and only makes noise when the truck is twisted going into a bad driveway or something. Maybe it'll be aight!

Jason
2006 F250 2wd 6.0 psd, 8.96 1/8th mile with canned SCT tunes, now running Spartan Hybrid Race tune! AFE Stage 2 PRO DRY S, 4" turbo back str8 pipe in front of rear tire, auto, crew cab short bed, ZOO DAD mod, 5% tint over the factory tint.
Track Times!
Reaction---.674
60 ft-------1.892
594 ft------8.370
1/8th ET---8.965
1/8th MPH--75.63
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