offroad H or X pipe??

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I've heard they rattle from a few people

The fact that you even said that, tells me that you shouldn't get an X. I take it you don't like exhaust that pops? if not then you don't want an X ... Well that is depending on what kind of mufflers you have... But Its all in personal taste... its hard for somebody to ask you how they will like something considering your not them... u know what i mean? If u have any kind of chambered muffler... its going to pop 2x worse than the offroad H... but its gonna be 3x louder than the H... And i can say from experiencec that X lose a little low end torque... but get a decent amount of top end power... I mainly got it for the sound tho... performance gains aren't going to be large enough over a O/R H to justify spending the money... that is of course unless you have lots and lots of money... in either case you decide... I have O/R Bassani X with 2 chamber flows and i love it... But thats me... Its all up 2 your preference... check this place out before you decide on one or the other www.mustangexhaust.com

good luck!