Performance gains cant be found with a pannel filter or kit on the 1.4 (and if there is its not noticable lol) so for sound a induction kit is the best
drill holes in your airbox
£150 for some noise though.
Pay me £100 and I'll make u a cd of me going "bwaaaaaarp"
Yes, the advice wether you chose to take it is to buy second hand, or get a panel filter.
I wouldnt be wasting £150 on a filter.
I have a pipercross cone filter you could have if it would fit?