mbrp 3.5" downpipe
Junior User
Joined: Dec 2006
Posts: 71
Likes: 0
i have the 3.5 inch mbrp downpipe, easiest mod i ever did, took me like 15 minutes by myself. if you have someone to help you it will take 5 minutes. as for fitting up to the cat, i cant help you there becase mine is straight piped. but all you have to do is see if it will fit up with it and if it doesnt then go to you local auto part store and get an adapter to make it work
Tuned
Joined: Jun 2006
Posts: 420
Likes: 3
but i will say that having a dp that is easily removed makes for a lot more room up there for future mods/work. i tried to plug my egr with the "frost plug" mod last week but had to give up because it was just too tight and i didn't feel like chopping up my exhaust just to get the dp out. i would compare the cost of a full system vs just the dp and see what works for you.
Mountain Pass
Joined: Sep 2006
Posts: 101
Likes: 0
What about us guys that have straight piped the factory exhaust? I put in a muffler delete pipe and used the pipe that connects to the down pipe from a 7.3 truck that bolts in place of the cat. Would this benefit me at all? Anyone know if it has the same style flange that is where the down pipe would normally bolt to the cat? Thanks.
2005 F250 Ex Cab, Long Box, XLT, 6.0L
2005 F250 Ex Cab, Long Box, XLT, 6.0L
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
The MBRP down pipe has a different style flange than the OEM setup. You may have a leakage at the DP and cat, but it just needs some adjusting to line up correctly to prevent the leaking.
I run the MBRP DP and MBRP cat delete pipe into the OEM tubing. Fits like a glove, no leaks and sounds great with the muffler deleted.
I run the MBRP DP and MBRP cat delete pipe into the OEM tubing. Fits like a glove, no leaks and sounds great with the muffler deleted.
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Postmaster
Joined: Jan 2005
Posts: 4,743
Likes: 3
From: Peoria, IL
Yes it should go in fine. That is how it works with the full exhaust system, the downpipe goes in, bolts to the front of the stock cat, then the rest bolts behind the stock cat.
Yeah my tech had a bit of a hard time keeping it from leaking there, just had to use a couple of gaskets. I've got the cat delete pipe, but haven't put it in yet. The dealer said they wouldn't do it, and it "might" voide my warranty. With the problems I've had so far this winter I'm glad it isn't in yet.
Yeah my tech had a bit of a hard time keeping it from leaking there, just had to use a couple of gaskets. I've got the cat delete pipe, but haven't put it in yet. The dealer said they wouldn't do it, and it "might" voide my warranty. With the problems I've had so far this winter I'm glad it isn't in yet.
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Posting Guru
Joined: May 2003
Posts: 1,990
Likes: 1
From: Middleburg, FL
As far as the original question, the 3.5 MBRP DP should fit to your stock CAT as their exhaust systems are designed to work with or without the stock CAT. However, the MBRP DP is a two piece design vice the stock one piece. Make sure you get both pieces if you proceed.
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