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  #16  
Old 02-02-2010, 10:09 PM
bigcountry bigcountry is offline
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not in that order you would want to put the bung on the new pipe first before you install it on the truck then cut off the second cat then install your new pipe with the bung already in it then after its all welded up add your 02 sensor and plug er up
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  #17  
Old 02-02-2010, 10:11 PM
TrePaul86 TrePaul86 is offline
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Quote:
Originally Posted by bigcountry View Post
the BUNG is where the 02 sensor goes into the pipe before and after the cat and correct me if im wrong but the last cat the real one you have 2 one is a precat and the other is the auctual one
From what I know it goes like this. 2 "pre-cats" on the y-pipe coming off each head. Each side of the y-pipe has a separate o2 sensor on it. Then it goes down to the collector or the end of the y-pipe where it meets a section of tubing where 2 cats are placed. The first one on 2001+ 4.0L's, is almost impossible to remove due to it's shape and pipe formation. The second cat after the y-pipe however, is removable and requires some fab work to take out. Making sure if you do, you put an "s" bend in the pipe to meet the factory requirements for where that last cat used to be.

Quote:
Originally Posted by FireFighter27 View Post
does removing that last cat increase sound and allow for a pass on emissions?
I just went through emmisions in Nov '09, and since I'm an 01 with OBDII computer system, they plugged in my truck, let it read for 30 seconds and I was off and outta there with new tags.

The removal did make for a little bit more sound and some throttle response as well as a few mpg on the highway. But like I said, it does require some work and thinking as well as a welder and a way to cut the pipe. No exhaust shop will remove a cat, it's against the law. At least here in Oregon.

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Originally Posted by FireFighter27 View Post
so remove the second cat, put a filler pipe on and bung it?
Read above reply.
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  #18  
Old 02-02-2010, 10:11 PM
BAMA BOY BAMA BOY is offline
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leave the cats, run a straight pipe, sounds good not too loud, great idle
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  #19  
Old 02-02-2010, 10:14 PM
FireFighter27 FireFighter27 is offline
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so you removed the cat on the pipe that conected the headers to the muffler right? like...you have the headers that connect to a flange and then flange leads to a cat which leads to the muffler and tailpipe right?
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  #20  
Old 02-02-2010, 10:15 PM
TrePaul86 TrePaul86 is offline
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Look at your exhaust system man... I removed the very last cat in the system... Now I have 1 cat after the y-pipe, not 2... The cats on the y-pipe are also very hard to replace with a straight pipe.
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  #21  
Old 02-02-2010, 10:20 PM
FireFighter27 FireFighter27 is offline
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ohhhh ok, i see what you mean now...to bung that extra pipe, i drill a hole in to screw the o2 sensor into the pipe right?
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2003 Ford Ranger XLT FX4 Supercab
Flowmaster 40 with 2.5" pipe
Back Rack
Cobra CB Radio
Bearcat Fire Scanner
Hood mount antenna
Delta Tool Box
Dual shoty CB whips
WAAG Grille Guard
31" BFGOODRICH ALL-TERRAIN T/A KO
Front Fog Lights
Rear Work Lights
Tailgate Reflectors
WHELEN EDGE lightbar
WHELEN LIN 3 Gille Lights
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