If your goal is to one day make it a 10 sec car then you are wasting your time. If you want to make a mod or two to get better milage or power then go for it. I would say a K&N drop in and maybe a cat back for minor performance gains. Read the how to on the throttle body optimizing for some almost free power.
98 SE Sport. custom catback, Intrax springs, 3L, 3L valves, APEXi S-AFC, 24# injectors.
Other cars:
72 Challenger 360 motor 727 trans (used for parts)
73 Challenger 340 motor 727 trans 15.60 1/4 with bad miss and clogged fuel filter.
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