I'm late to the game, installed the z1 intakes. LOVE the sound!!! I don't understand why the sound isn't discussed enough, it's just a night/day difference, a lot louder than I expected
Install was easy except I forgot about one thing: The STUPID bolt that holds in that rectangular plastic piece from the stock inlet (by the radiator where you slip the z1 hose through, most people trim this section). Wish I'd paid closer attention to the videos online. One thing I Found: It didn't seem like you really needed to take the whole bumper off, just undo the sides, and top, and pull it back a bit.
Not sure on the whole power aspect...so will need to drive more, but I did hammer it in 1st to 2nd, and it seemed to move a little hastier...
