Fitzy, I was in your boat a few months ago, heres is 2 pieces of advice. 1/ The easiest mod by far, the F6 air box with a K&N, should be able to pick this up from anywhere in-between 200-300, if you feel like cutting holes in your air airbox, you can pick the second snorkel up for up to $100 and the filter for about $120. This mod will offer a difference of maybe 10-15kw with a tune. 2/ Take the Nike approach, as in "Just do it" that's what I did. process west stage 3, exhaust and a tune, then you make around 500rwhp and you can sit back and watch your gay mates catch up.