[hydrex]

A 180 thermostat will do a lot. You can adjust fan settings to keep under hood temps down. I now have 330,000 miles on my hemi, original everything under hood, except for replacing an EGR valve and of course oil and spark plugs. There are better cold air intakes than the K&N. Check out (LMI) Legmaker intakes. Got 9 more rwhp with his on the dyno. As long as you don't have to contend with emissions, go for it. I run long tube headers, no cats and the Borla cat back with no resonators and 6" tips, plus the mild sidewinder cam (not for a SRT8) Total hp increase with those mods, went from 268 rwhp to 333 rwhp, but the tuning was a lot of getting the power.