Another vote here for the Volant. Sealed from engine heat and external moisture. But, anything is an improvement over stock...

 

That is the same setup as mine basically. Never dyno'd it though with the intake swap.

I'l be honest with ya. IMO, most of the intakes are all gonna add about the same amount of power, which in most cases, ain't gonna be much. Its not like airraid will add 10 hp, oh, but vararam king cobra, it adds 35 hp. Common, if it sounds too good to be true, it usually is. I'm sure that some have better fitment qualities than others, and there will be a certain variance of power from intake to intake, but its not like it will, in most cases be a dramatic difference.

Oh, and as far as the UPD intake, they look nice, but I have heard of a lot of them cracking.