I initially went for a K&N 57i kit, with a tegiwa heat shield and a silicone elbow............at full throttle it was very loud, I swapped the K&N filter for a ram air foam one, no noticeable difference
Then I removed it all and went back to standard, mainly down to an awful intake sound at idle........
However, today, I am trying out a K&N typhoon kit, with the tegiwa heat shield and a ramair cold air feed, the awful intake sound at idle has disappeared, havent gone out on the road to test it yet though