Need help with this project

[Lobo grand am]

Hello everyone i'm new at this site, but today I came here with a couple of questions... I have a  2001  2.4L  twin cam Grand Am SE but I really want to do some mods to gain some extra HP, what can I do for it? and what can I do for an aggressive sound? I was thinking about putting a supercharger or turbocharger but what do you recommend  for me? 

Recently mods on the car: performance camshaft, air intake, autolite xp iridium spark plugs, racing thermostat and ported heads.

[notallthere]

Right now you have the motor inhaling pretty well.  Now it needs to exhale.  Headers, full exhaust free flow cats.  I would do this before I would worry about a turbo or a super charger. 

 

Welcome to the site.

[Lobo grand am]

Thanks!! By the way, witch Flowmaster or magnaflow should I pick? It's a v4 but I don't want the sound like a honda guy,  and only have 1 muffler with dual tip, but today i'm gonna put the a brand new muffler on the other side to get 2 mufflers with dual tip

[Ringo64]

I have little experience with these 4 bangers but