FYI - I have used all of these.
With TORs and trip K&N 2780s (fit under claw) you can get 25 or more RWHP with a proper tune.
The RamAir improves air flow a little over the K&Ns and also fits under the claw.
The addition of headers (in my case CES) can add another 10 - 15 RWHP (again with a proper tune).
