I have a 2008 jeep wrangler jk unlimetd x i want to get a deeper throatier sound i have flowmaster 30 offroad series on it now it sounds good but i want great deep sound ive heard the four cat bubbles are there to create back preassure is this true has anyone done this ive searched all over for a test pipe or highflow cat and when i enter year make and model nothing any ideas

Bump because I need to know the answer to this myself.

I have read a few posts from people saying they did not like the low end torque loss from straight pipes. I am sure though that is all subjective to individual preferences.

If you remove the cats you will pop trouble codes from the computer though. The after cat O2 sensor reading will not be right is I think what happens. And of course the computer won;t like having no O2 sensors. So you probably have to get a gadjet to feed the computer a signal that makes it think the cats are still there and fine.

On something like the 3.8 I do not see how you going to get a "deep" sound anyway and it is probably not worth the hassle IMO.

I'm using only 2 cats, had the other two cut out. Through a couple o2 codes for about 2 weeks then I guess it just learned cause it hasn't tossed up any codes for awhile now.

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Did you notice any difference at all?

IMO, I think you would have been better off to have just deleted the OEM muffler and leave the cats alone. Would have been cheaper and easier also.

Did you feel a difference? Performance? Sound? anything? and the ones you have left are right after the headers I presume?

I remember on the ram forums they would take different size bungs and put in steeln wool when they removed cats to make o2 sensors think cats were still there