diesel dude
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Joined: Jan 2004
Posts: 1,539
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From: Snohomish, Washington
Originally Posted by Kaloha
IT is illegal to remove the cat. I hear its ahealthy fine if you get caught. but you can go 4" cat back and 4" cat to turbo
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Posting Guru
Joined: Jan 2004
Posts: 1,185
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From: Tennessee
what sensor? Buddy has a straight piped. Loud as he** and high pitched screaching noise from turb but it will fly!
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No sensor other than it's a FEDERAL law you are breaking if you remove the cat...
and I'm just passing on the data presented by others (since I have my cat on with my turbo back exhaust) but some did dynos and 1.4's with and without cats, and if done properly showed VERY little difference with or without...
The cat has a HUGE centerline that can be little restriction if connected right...
and I'm just passing on the data presented by others (since I have my cat on with my turbo back exhaust) but some did dynos and 1.4's with and without cats, and if done properly showed VERY little difference with or without...
The cat has a HUGE centerline that can be little restriction if connected right...
Posting Guru
Joined: Jan 2004
Posts: 1,539
Likes: 1
From: Snohomish, Washington
I called Banks and forget what I stated. They now make a downpipe for the '04 and they also stated that they were not aware of any issues of removing the CAT except being illegal. They, however, stated that this is not advised. (I think they have to say that) 
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Joined: Apr 2004
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From: denver, co
I have straight exaust 4" from cat back {no muffler} and you can hear the turbo wind.but it is not that bad inside the cab , mabe 5 to 10 % loader. from the outside it sounds like a jet when you hit the peddle