You have to remove the original airbox. Some of which is in the wheel arch so I had to remove the wheel arch lining to get it out.

Jack the car up renmove, wheel to get to wheel arch lining, remove lining then undo all the bolts holding original airbox in place
A few bolts and claps and its done.

PW fits really well and is a quality product.
Sounds really loud though, so you need to get use to that swoosh sound.

Helps air flow definitely but how much power gain without tune is unknown.
Cheers Tim