I had the larger Saleen Heat exchanger put into my 06 back in 2009. It held a good deal more coolant as well as the fluid speed through the system was increased a good deal, and it has 2 cooling fans as well.
Comparing how the unit brought down intake heat levels after boosting and being parked for 30 minutes on a hot day, there really was a significant difference in the speed the temp was brought down and the final standard driving intake temp was brought down by the unit. Nearly a 20 degree difference in running temp average on a really hot day with my 10 lb tune on my Series VI. went from about 158-160 to about 138-140 after a few minutes after running hard and parking for that 1/2 hour. Well worth it. Erik