Supercharger.

 

i guess it comes down to which is cooler to you..

a whining motor
or a lopey one?

both will get heads turning fast...
both will put you in the 11's
both will scare old ladys and small children
both will make your friends drool...

but.....
i have never seen a whining motor get em wet like a deep growl of a v8 lopen through lt headers and true duels or cut out.....

FI is cool to your buds...
cams get em wet...

your choice