Underdrives are useless. E-fan is a great mod.. I didnt do a cheap e-fan setup. Mine uses a DCC controller and uses 2 fans, 1 16" and 1 14". The dcc control allows the larger fan to come on to control engine temp, and allows both fans to run when i have the AC on in the hot florida summers sitting in traffic..

 

I would say different. That would be like saying a lighter flywheel doesn't do anything. Your E fan's help free up hp by getting rid of the restrictive mass of the clutch fan, allowing the drive/pulley system to spin more freely. Lighter pulley's will provide gains as well and help with throttle response.

 

I picked up my Hurst shift kit today. It took about and hour taking my time while trying to let the 13yr old spin a wrench and help out. I was very happy with how positive the shifts feel now. I've only driven around town and haven't had to much driveline noise I've read that some guys experience. I only had a 3 mile commute so I plan on taking a detour on the way to work and drive on the freeway to hear and feel the difference.

 

So I drove the freeway for a while and between the exhaust and the rattle wagon doors I can't really notice any extra noise