every 2j recommendation should come with the caveat "make sure you're tuned for it, and it's awful to install and maintain". It does sound good, but god is it a bitch to install without *any* documentation from 2j. Unless they spontaneously started actually supporting the product, that is. I think there's a long thread on the forums here, the ownership/post sales experience usually amounts to "thanks for your purchase, f--k you"
It does sound great though - but its like eating cake every day, too much of a good thing. Want to listen to music? Nope. Want to have a quiet conversation? Nope. Want to have a phonecall using the built in bluetooth? Nope. Maybe if you live somewhere flat it's less intrusive, but if you live somewhere hilly at all, it gets old really quick.
Note: I like my mods tidy. I like well engineered, documented, supported products. I don't want pcv hoses flopping around, I don't want an intake pipe rubbing the insulation off of wires on a sensor on the back of the engine, etc. With the 2j, you really *do* get what you pay for.