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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-26-2007
mersingt's Avatar
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intake and cat ?

1st question
Ok so I have a k and n drop in filter no airbox snorkel (removed it) along with that peice near the headlight.

would I benifit from a cold air intake? Ive got a catback.


2nd question

Will a hi flow cat do anything? Im gonna get one its just more cause I want to change the sound than anything? and to those who have a hi flow how did it change your sound?
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Old 01-26-2007
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well the actual intake will help because u lose all the ribs inside the stock hose that slow air down. also even with the airbox mod u still have the box. im sure the open element will flow a lot better.

as far as the high flow cat, my buddy put one on his Integra and the exhaust note did not change. maybe its different with a v6 but not sure. im sure it would sounder meaner
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Old 01-26-2007
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you have like 4 cats... the last one hollow it out its useless the big one infront of the o2 replace with a high flow and youll be good to go..i did it i have a good pick up speed..
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Old 01-27-2007
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Might as well cut it off instead of hollowing it out..

Did your exhaust note change any after you did that?
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Old 01-28-2007
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well just incase they actually saw it was gone id rather shove a 2.5" pipe through it
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Old 01-28-2007
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That would work too, but i doubt its going to matter if its totally gone...You have 4 cats on there anyway.
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Old 01-31-2007
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i was reading another post, and the guy said that when he took his truck in to get exhaust, the guy took one of his cats off. And he went from getting 16-17 to around 14 - 15. Can anybody back this up. I thought that once you free up more cats, its more free-flowing = more power.
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Old 01-31-2007
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u need some backpressure on an NA engine beacuse having backpressure helps suck out the exhaust gases fron the cylinder when the exhaust valve is open. so yes u will lose power if u take off all the cats. on a turbo car, the turbo causes enough backpressure and since there is boost, the exhaust gases exit under pressure
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