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Old 03-24-2009, 03:25 PM
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4" MBRP Install

How many that have an OBS and put a 4" exhaust with the 3" DP had problems installing? I've heard from some people that I have to bang the firewall back, and some say I wont. I found a write up, but it was for 5" exhaust on a NBS style truck. Can anyone give me some tips on putting this in before I tear into it?
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Old 03-24-2009, 03:27 PM
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You should have to bend it a little bit otherwise the DP will rattle against the firewall, I wedged 2x4 between the block and firewall and pried it a couple times and that did the job, everything else is straightforward. To get the old one out just use the good old sawzall
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Old 03-24-2009, 03:29 PM
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Quote:
Originally Posted by Matt P View Post
You should have to bend it a little bit otherwise the DP will rattle against the firewall, I wedged 2x4 between the block and firewall and pried it a couple times and that did the job, everything else is straightforward. To get the old one out just use the good old sawzall
Yeah, looks like a sawzall will work good on this lmao. I finally got a good look at the stock DP today, and its like 1/4" all the way down to the freakin cat! I can't belive this thing even runs like that
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Old 03-24-2009, 03:30 PM
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yeah wait til you pull it out and realize what a pancake that thing is, the sawzall will come in very handy
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Old 03-24-2009, 03:31 PM
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Originally Posted by Matt P View Post
yeah wait til you pull it out and realize what a pancake that thing is, the sawzall will come in very handy
So how hard is it to get the old one off? It looks like a PITA.

How long e/t did it take to do the whole installation?
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Old 03-24-2009, 03:32 PM
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Its a PIA, all together it took about 4 hours, keep in mind that was my first time doing exhaust ever and was the first thing I did on my truck, I can get the exhasut done in about an hour now, hardest part is getting the old one out. Cut the downpipe as high up as you can from the bottom and cut it at the bend up top and you should be able to slide it out
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Old 03-24-2009, 03:35 PM
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Quote:
Originally Posted by Matt P View Post
Its a PIA, all together it took about 4 hours, keep in mind that was my first time doing exhaust ever and was the first thing I did on my truck, I can get the exhasut done in about an hour now, hardest part is getting the old one out. Cut the downpipe as high up as you can from the bottom and cut it at the bend up top and you should be able to slide it out
Everyone says cut it as high up as possible, but it looks to me as if I just cut it off the cat, and unclamp it, I can pull it out?
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Old 03-24-2009, 03:38 PM
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Nope you need to cut it as high as possible, the stock DP has a lot of bends so you need to cut as much off as possible first so you can move it around easily to wiggle it out
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Old 03-24-2009, 03:39 PM
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Originally Posted by Matt P View Post
Nope you need to cut it as high as possible, the stock DP has a lot of bends so you need to cut as much off as possible first so you can move it around easily to wiggle it out
So its that hard... damn. F*** it, you come do it and I'll get you hammered as hell.
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Old 03-24-2009, 03:40 PM
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Originally Posted by Tyler View Post
So its that hard... damn. F*** it, you come do it and I'll get you hammered as hell.
its not that hard, just takes a little time, Id come do it if my truck was running right now.
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