You can do the one ball mod, IMO you prolly wont even notice a difference, also if you're looking for mods without increasing supercharger noise, look into a bigger cam.. I got one on mine and I like the results so far, it's a little bit more powerful and the engine itself is much louder at high rpms, paid $295 shipped for mine

 

Def. go with a pulley. Not just for power but increased drive-ability. Driving around parking lots at low speed is much more enjoyable without all the yo-yo and lurching.

 

Welp, the serpentine belt snapped last night - so I think I'm doing the WMW Pulley Kit as an upgraded fix.

I did end up doing the one-ball mod... not much of a difference (compared to a true exhaust system), but IMO it was worth the $60-some dollars I paid for the job.

Cheers!