Originally Posted by Karl

There is a reasonably noticable difference between a std 2wd cooler and a RS500 style one when using a std T3. The response and lag is better with the 2wd cooler, so I'd say better to stick with the std cooler as long as you are'nt running more than around 20psi.

Obviously if you are running the T3 very hard, the charge temps can get quite high with the 2wd item so an Rs500 item would be better in that instance, but personally Id rather have the better response of the 2wd cooler and little lower boost. Overall more pleasant to drive.

Originally Posted by Caddyshack

I have an old 4x4 one sitting here if you want to try one.

Originally Posted by The Crocodile Hunter

Mine had the standard t3 and cooler running greens when i bought the car. One of the first mods i did was change to a 500 style cooler.

I have dyno printouts from before and after done on the same rollers but obviously on different days and it gained 25lb/ft of torque, power stayed the same.

Didn't really notice it having more lag?

If you don't want the 500 cooler definitely use a 4x4 over the tiny 2wd