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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 09-06-2007
DerangedPony's Avatar
I am: Jeff G
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Originally Posted by IN2 FX4
Removing or disabling the cat will result in higher emmisions under certain conditions and will make the exhaust slightly louder.

True.....if the cat is before the O2 sensor. Some Rangers, like my 03, have a cat AFTER the O2 sensor.

I'm still not sure if I'll take a cat out.....just thinking out loud.
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Old 09-06-2007
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why would you do this? you will see no gain in power and it will sound like ***, hollowing a converter makes it an echo chamber and the exhaust pulses get screwed up bigtime. plus its bad for the enviorment


i have a testpipe somewhere i'll sell cheap
i even have a custom rear cat removal dual setup for sale, already boxed and ready to ship
front section

rear section

this was on my reg cab, its a flowmaster delta 70 dual in/dual out
70 bucks and its yours

Last edited by 04 EDGE; 09-06-2007 at 06:17 PM.
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Old 09-07-2007
karrbass4life's Avatar
I am: Brandon K.
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Don't our Rangers come factory with High Flow cats anyway?
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Old 09-11-2007
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On a stock motor limited to stock rpms your not going to see much if any power improvements in the *normal* driving rpms.

These motors are short stroke motors. So in the 1000 to 3000 rpm area (where we spend most of our time) there really is not that much air moved.

If you spent time in the 3000+ rpms.. then you would see some power improvements. But come on.. how many "4.0L rangers" spend time up in those areas?

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