Shocktech Super Fly Bolt
Halo B w/rip drive
Reduced Kick and noise
You can't get it for free
I feel that this is one of the best upgrades you can get for your Intimidator, period. It is very inexpensive (27 bucks isn't a lot in paintball terms) and the results are very noticable. I immediately noticed significant decrease in recoil and noise. I really believe that my gun has the same amount of kick as a DM/PM now. Installlation is extremely easy. You just take out the old ram, lube this one and slide it in. Also, Lurker is a great guy. If you have any problem/question he'll respond to any of your questions as quickly as possible. Personally, he has as good of customer service I've seen in the paintball industry (on part with BLAST).
This is overall the best upgrade you can get for your Intimidator. It reduces kick, noise and is extremely cheap. This is a must buy.