squeaks are inevitable but get some bilstein shock replacements to get those god-awfully HORRIBLE oem shocks out of their and the ride will be firmer and much more improved from how it is driving now. it'll even feel new! have your truck claybarred and then polished and waxed and the finish will return to a beautiful shine. performance wise for increased feel in power perhaps getting some hi-flow cats and a custom exhaust could help. i'm sure the performance enthusiasts could offer some suggestions.