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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 09-18-2007
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I am: Brian Neff
Join Date: Aug 2007
Location: Los Alamos
Vehicle: 2001 Ford Ranger
Posts: 64
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cat converters

Ive read a lot of posts about adding power by removing the cat converters. Is this true and if so how would i do it? are there kits or what? Help please!!!
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Old 09-18-2007
5speedin2.3's Avatar
I am: Daniel K
Join Date: May 2005
Location: Livonia, Mi
Vehicle: 1997 Ford Ranger XLT
Posts: 12
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no, unless your truck is from the 70's removing the cats will do nothing.

all newer vehicle's come with high flow cats from the factory.

if anything you will lose back pressure and make your truck slower.
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Old 09-21-2007
04BlackFX4's Avatar
I am: Nick -
Join Date: Jun 2006
Location: Maine
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i dont think it would make your truck "slower" i think you would get a better sound and probably more low end power. could be wrong but letting more air in and letting more air out frees up more power, within reason.

Oh and if you're looking for more power, try getting a programmer or something. Im sure somebody here can give more info than me.

Last edited by 04BlackFX4; 09-21-2007 at 02:37 PM.
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Old 10-01-2007
GearBoxKevin's Avatar
I am: Kevin .
Join Date: Jul 2007
Location: North Georgia
Vehicle: 1995 Ford Ranger Super
Posts: 89
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I did a back pressure test on my 95's 4.0L upstream and downstream of the twin factory cats with 102K miles on them (with an aftermarket cat back exhaust) . At 4500 rpm the needle didn't move on the gauge. So 0 back pressure with my factory cats.
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Old 10-01-2007
Mike9825's Avatar
I am: Mike S
Join Date: Jun 2006
Location: Willard OH
Vehicle: 1998
Posts: 489
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Unless your engine has forced induction or it's built for drag racing, removing the cats won't gain you anything except a deeper sounding exhaust. -Mike-
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