2001 Seat Leon cupra 1.8t 20v, k&n induction kit, opinions

[Redworminator]

Thinking of installing a 57i induction kit to my Leon, have experience of these on various other cars. I love the sound they produce but not sure how they affect performance, any ideas?

 

[bigT's lcr]

Ive got the k&n typhoon. Ment for the mk2leon/mk5 golf but it fits. Just
Sounds ace