Just an update... I decided to go for the F6 CAI, heck if its good enough for a stock 270kw engine its good enough for my n/a 6. Cost $103 inc. tax for the XR6T upper intake and the XR8 lower headlight snorkel, installation was simple. I have noticed a difference already, suprisingly more lower down in the revs, maybe because of less vacuum in the intake tube? The reason I chose this was because the air rammed in through the lower bar would just build pressure up under the headlight anyway, and I wouldn't have to worry about the dirt, water, etc. Also, for $100 you can't really go wrong