95 GT...Mods?

My freind just got a 95 GT, and he wants to do some basic mods. He wants to mod it a bit, but hes not sure what to do. I suggested an intake + exhaust, and maybe some igniton upgrades. He's got Toyo Proxes S1's on 17 inch rims. What else would be a good idea for his car?
Also, recomend some exhausts that dont sound rattly/overly loud/shitty. if possible, let me know if you guys have audio of the exhausts u suggest. thanks much guys.

defiantly hks or pacesetter exhuast, if you gunna do exhuast do headers too, and a striahgt pipe or high flow cat...

after that the only way your gunna make power is with internals like cams ....etc