Dude, these filters really work well when combined with a decent performance exhaust, although you will need to have the engine set up after on a rolling road to gain the best possible power increase...Make sure you get it done at a reputable tuners too...Dont trust just anyone to do it.. With the above done you should see an extra 20 to 40 B.H.P and more response with higher rev's...\nNext step is a Stage 3 cylinder head and some super sticky tyres...Fuuuuun !