I've been trying to do some research on my new 09 FX4, I wanted to do a K&N cold air sys and maybe the Gibson cat back dual but some say reducing the back pressure will cause some premature wear. Anyone have thoughts or done this?

I got the same truck and interested in this question aswell!!!..so any help appreciated guys!

I don't see why it would affect it

what premature wear is it gonna cause?

I have a aftermarket car back exhaust and nothing has gone wrong with 4 years of use

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I read somewhere that not enough back pressure would unseat the oil rings on the pistons obviously causing it to use oil, now I am old school and never of such a thing however that doesn't make me right. I just want to get it right the first time

I have never heard of that.

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I have never heard anything like that either. If you go with pipes that have a diameter that's too large, you'll lose back pressure and therefore some low end power, but it's not going to actually hurt anything. There a LOTS of guys who run 2.5" pipe. I've heard in a few places that's as large as you should go with the 4.0 Ranger.

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ɹǝʌo ǝɯ dılɟ

Ya like Jay said you keep the same diameter pipe no loss of back pressure would stay the same then

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