Any big difference between a GREEN FILTER replacement and a PIPER CROSS replacement, the PIPER cross say a poss increase of 3-5hp and the GREEN only say 2-3hp, but the PIPER cross is half the price??????? Or is the PIPER crosss just ****e???

 

on my old scoob i tried kn/ hks/ piper cross in my opinion the piper cross worked a touch better.the metal gauze over the hks filter was red hot in the summer and the car suffered badly.kn was knackered in quick time .loads on here will use all three.marginal on performance.

 

I bought the Green Filter, £42 delivered from Japan Import Import Car Bits (on eBay).