So Im looking for recommendations for a cai. Where would I find a good setup for a 04 s60?

 

Easiest way: utilize the factory system as it is effectively a CAI, just swap out the stock filter with a K&N (what I did).

Middle way: delete the factory airbox and use a "pop in" style cone filter on your stock piping.

Best way bit hardest: pick your self up the Snabb Fresh Air Pipe, do a stock airbox delete and use a cone filter with that entire system installed.

Have fun, any of these are a major improvement on a turbo car. Less restriction the better.