This past weekend I saw what a change in a thermostat can do... Even though its a different car, it proved gains...

A buddy of mine with a SRT8 Magnum dyno'd at a recent event that we held... The only change he had was from the previous time he dynoed was a thermostat and a intake. He put down 335 whp bone stock, his engine temps were 220... with the thermostat his engine temp was 185, he dyno'd 385 whp... that's a 50 whp gain... at the track, he gained took off .35 tenth in the 1/4 mile.

I think the SRT6 will GREATLY show improvements if you get the engine temps lower.