Join Date: Jun 2007
Location: White Oak, IN
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The staight up answer is removing the cat is illegal...it is a federal law that emissions equipment must stay in place.
With that said, many people remove them. I'm not sure what the other exhaust companies offer, but MBRP has a few options for ditching the kitty.
First, you can get a standard cat-back and then add the cat test pipe...basically a delete pipe. This is nice because if you would need to put the cat back in for emission testing, it is a fairly simple deal.
Second, you could get a turbo back and add the cat delete pipe...same as above, except you get the downpipe.
Third, and also the route that I went, is the turbo back off-road kit. There is no provision to re-install the cat in this system.
Which you choose is up to you though.
As for your questions, removing the cat will not hurt anything as far as the engine goes. Some say it helps performance, I personally don't think it did much for me except help lower the egts some. DO NOT just gut it and throw it back up there...no reason to waste a good cat when there are other options. Besides, you may need it someday.
I ran my truck for about 2 years with this exhaust and the MBRP muffler. I liked it, but I wanted a little more. I thought about turning the muffler backwards, which would have made it a little louder, but I decided to just get the muffler delete pipe...I LOVE IT. It is louder, it really sounds like a jet engine, but when I get into it, it really talks. Well, more like it yells. But just driving normally I really can't tell much differance with the windows up. My only regret is not getting the muffler delete sooner.
2005 F250 4x4 6.0L PSD, 6 Speed hand shaker
Dark Shadow Gray
SCT xCal2 with DJ's Tunes, MBRP Turbo-back Offroad exhaust...bye, bye kitty and muffler.
Finally studed, EGR deleted, blue spring, Zoodad and AFE CAI