I like sleeper performance- the type that leaves the jaw hanging after the fact. On my last Buick Grand National (475hp/650tq) I chose to leave the appearance stock- sneaky mods included:
1) factory 15x7 steel wheels widened to 10" to carry a 275/60r15 drag radial- center moved to stock offset so everything tucked into the wheelwell.
2) replaced intercooler with a Ford Powerstroke intercooler (painted black to look like the radiator)
3) 90/10 shocks up front
4) hidden line lock
5) hidden alcohol injection
and more. Car looked stock, sounded stock, didn't elicit any undue attention (as from the police!)- but drop the hammer, and My. Hyde came alive!
Got plans for this truck, too