The NRG one is tops in my opinion. They're very close to Spoon ones as a matter of fact...if not, better without the JDM wank factor. Keeps the extra engine movement under control and gives you a bit more traction. Your engine will put down torque better with one of these, but in no way will it offer you any power gains...just allows your car to move off the line easier without as much wheel hop.

You'll have a bit more cabin noise since it's attached between your block and firewall...It's totally worth it though.

Cheers