My exhaust system is completely stock except for the fact that I removed my mufflers and installed bottles (resonators) instead. It's a bit deeper louder, but no performance gains. What would an X or H o/r sound like with my bottles? Do u think i'd see more of a gain then if I just had my mufflers?

 

You'll definetly see a gain from an x or h pipe, it's not gonna be like 10 horsepower but it'll get you a few and alot better sound.

 

You will see some gains from an aftermarket midpipe maybe 5-6 rwhp.

From what it sounds like you have something like glasspacks? Ive never heard of bottles, but if they are real cheap resonators like glasspacks, and X or H is only going to make it sound worse. I would really invest in a catback first, JMHO.