Why spend on a header that will be useless of you want to go turbo?
I say just turbo the a3, when that goes buy a k24. Depending on your hp goals your turbo kit will eliminate the need for a vtec head. Lots of ivtec head k24s run big boost and net good results.
Do this, buy a k24 then swap it in or slap on a turbo kit.
If you really want to stay NA for now buy a k24a1. The cost of an a2 head and bolt ons with a tune is like $1000. A k24a1 should cost in that neighborhood.
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