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Old 04-10-2010
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Cat removal questions

I just got my Flowmaster 40 delta flow put on this week and it really does not sound as good as I was hoping. I was wondering what affect in sound would I have if I removed one or two cats? I know there are emission laws and all that, but there is not testing here. So how many could I take off, im not sure how many there are to start with. Any other suggestions for making it sound a little louder and more aggressive would be great. I have a 2002 Ranger 4.0L XLT 4X4 Off-Road.
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Old 04-10-2010
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Do you have O2 sensors? Removing the cats and O2 sensors will mess with engine I'm pretty sure, not just the cats, but the O2 sensors reading differently
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Old 04-10-2010
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you can only remove the one after your o2 sensor. whcih that will be the last cat
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Old 04-10-2010
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ok so thats the only one after an o2 sensor? Will this make a noticable difference in sound? Iv also read that I might lose some power by removing cats? Will there honestly be much of a difference with removing one out of 4 cats?
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Old 04-10-2010
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Not much difference, but whoever told you that cats are a power adder is an idiot.

Cats if anything, besides clean emissions, restrict power. It won't be a huge sound difference but you may notice it, since you already have the flowmaster
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Old 04-10-2010
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so other than taking the cat(s) off is there any other affordable way to make it louder and not sound ricey? I know I could get headers, but they are somewhat expensive
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Old 04-10-2010
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Quote:
Originally Posted by R.Kell410 View Post
so other than taking the cat(s) off is there any other affordable way to make it louder and not sound ricey? I know I could get headers, but they are somewhat expensive
Not really, exhaust and a single cat removal is about it, besides headers. I wish there was a way to replace all the cats with a single high flow cat and still make the O2 sensors read correctly
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Old 04-10-2010
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Not really, exhaust and a single cat removal is about it, besides headers. I wish there was a way to replace all the cats with a single high flow cat and still make the O2 sensors read correctly
You can remove the catalyst(s) and make it pass emissions without any catalyst(s) whatsoever - I passed emissions today as a matter of fact in my IX with no catalyst at all - that being said my motor is built and costs more than your truck did when it was brand new.

That being said, unless you have a built engine, it will more than likely make your performance WORSE.

If you want better sound find a muffler and modify from the catalyst back for a sound you like. Changing the exhaust from the catalyst forward requires fuel and timing recalibration to work correctly inside the ECU ROM.
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Old 04-10-2010
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Yea I forgot that modern engines are tuned with the cats being on. I don't plan on messing with them anyway
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Old 04-10-2010
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Yea I forgot that modern engines are tuned with the cats being on. I don't plan on messing with them anyway
Yes tuned in vehicle as well, with the entire vehicle "on"
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