I just got done installing a mac prochamber and magnaflow catback in my 01. The goddamn passengers side bolt connected to the manifold took me and my bud 2 hrs to break loose (the car was only about a foot off the ground. Once that was done installation was a piece of cake. So I go to start her up and HOLY CRAP she is loud, deep and mean, much louder than I thought she would be with the regular magnas. I freaking love this system, I don't think my girlfriend is going to appriciate it much though. Freeway driving has a little bit of drone, combine that with no sleep last nite installing the system and it makes for a killer headache. (hopefully I don't get one everytime I drive my car). I can't even imagin what an offroad pipe w/ MAGNAPCKS must sound like. It must be ridiculous. Anyway love the system, frickin awesome sound, and I couldn't Imagin the car any louder.