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high flow cats..

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Old 04-13-2011, 03:21 PM
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Default high flow cats..
Are they made for rear 2 cats, front 2 cats, or all 4 cats in 04 extended cab. Trying figure out what I need do for them!
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Old 04-13-2011, 03:39 PM
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Take all of your cats out and replace with 1) 94106 on each bank. Keep rear O2's as close to the cat as possible.
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Old 04-13-2011, 05:41 PM
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So. Take out all 4 and just have 1 cat on each side?
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Old 04-13-2011, 06:03 PM
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Yep. Not all of the 04-08 trucks had 4 cats. I believe the later years switched to a 2 cat system. If you are switching to hi flows you will only need 1 per side.
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Old 04-13-2011, 06:54 PM
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Thanks! So what about running 3 inch duals.. Is it gonna work?
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Old 04-13-2011, 08:23 PM
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Originally Posted by Barker15
Thanks! So what about running 3 inch duals.. Is it gonna work?
3" is too large. You'll kill your velocity and scavenging. 2.5" is the max for duals on a naturally aspirated motor.
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Old 04-13-2011, 10:02 PM
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Follow what Otto said and you will be good to go.
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Old 04-13-2011, 11:41 PM
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Originally Posted by kevhead75
Yep. Not all of the 04-08 trucks had 4 cats. I believe the later years switched to a 2 cat system. If you are switching to hi flows you will only need 1 per side.
Do you know which years dont have four because im looking to replace mine also?
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Old 04-14-2011, 12:13 AM
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Originally Posted by C-Money $

Do you know which years dont have four because im looking to replace mine also?
04-mid 05 came with 4. Anything after mid 05 is 2
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