Think what we could really do with is a meet at a rolling road where 1 CTR with just intake mods only could be used as a test bed and then take a couple of intake systems and run them on the rolling road to give comparison results.
Intake system suggested test list:-
STOCK AIR BOX
HONDATA MODDED AIRBOX
AEM V2
AEM CAI
ARC
GRUPPE M
INJEN CAI
BLITZ SONIC
HKS FILTER
plus any others peeps might think of.
They did it back in the day, and IIRC the Gruppe M came top, with the AEM CAI second and the ITG a close third. Although if my memory serves me right they had the AEM CAI poking out of the engine bay?
I have had most systems since I have been behind the wheel of a K20 powered engine.
Blitz - yes good for the noise but that is it.
Simota - As above - noise no gains
AEM CAI ( x 2) - Very good bit of kit, unfortunately in the UK it is not ideal due to roads being prone to flooding.
AEM V2 - Again good for the noise and I know Tom at TGM uses one in his race car and he knows his shizzle so they must be good but I can not see how they work effectively, saying that he is always on tracks with it so heatsoak is not an issue.
Hondata modded airbox with ITG replacement filter - Deffo and improvement over stock but not as good as a CAI.
ITG - A nice system, I had one on my DC5 and it seemed to make good gains without the induction 'roar'
Gruppe M
twisted
In my opinion this is the best of the lot. The Ram effect works so well, it has no water/damaged engine issues and is proven to be the best system out there
If you can stretch a little I would get the Gruppe M 110%
HTH