It's an absolute cinch to install and a no brainer really.

As EuroAccord13 said, the only hard part is removing the resonator from the stock intake. I ended up undoing the single screw retaining the bumper to the fender and carefully unclipped the corner of the bumper from under the headlight just enough to get my arm in with a 10mm socket/ratchet-ring spanner. If you don't have foglights you should be able to undo this bolt by laying under the car and reaching up.

If you follow the vague and marginally helpful Injen instructions it was shipped with, plus;

The K&N Typhoon instructions here:

http://www.kandn.com/instructions/69-0025.pdf

And this TSX owner's "Do It Yourself" walk-through:

http://www.acura-tsx.com/forums/show...=Injen+Install

Youll be fine.

Good Luck and you'll love it!!!!!