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but it would be revving its arse off on the hwy tho

Ahh yep

but the airbox also retricts the air with the valve in it

My old DC4 had a DIY CAI and sat very low in the front bar. car was 9cm to the ground and on my first engine (after 2 -3 weeks of getting it and my red p's in newcastle) i had no way to avoid a...

why not just go and get a hondata s100? their basic!

the h22a type s is the higher revving engine mate.
my 5th gen crossovers at 5200 or 5500. then and valve bounce is at 7800.. if its higher revving you are after do the h22a type s engine conversion.