No HP Gain

I've gained alot from those mods

I've had my car dyno'd every time I installed a mod.(brother works at a dyno shop) I have a 98 gt vert.

When I first dyno'd at 184rwhp and 264rwtq stock. all done on a dyno jet

After cold air (tunable induction) 195rwhp 274rwtq
after h-pipe (bbk O/R) 207rwhp 284rwtq
after t/b and plenum (75mm both bbk) 218rwhp 291rwtq
after pulleys (march) 221rwhp 293rwtq
tune 233rwhp 305rwtq

1/4 times stock 15.1@90mph

after all mods plus 3.73 gears

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ALSO I have pi heads being ported, pi intake, compcams cams and bbk long tubes to be installed. I got alot of this stuff from ebay used for under 1000 bucks, plus all of the other stuff I have already puts me at a grand total of $2700 bucks. 300hp maybe? way less than a blower.
 
it appears you already have gears, so other than that there is no single mod you can do other than cams maybe that would give you a significant wide powerband sotp feel short of getting a supercharger. a tuner is not a bad idea at all though. when i tuned my car with my superchips tuner i did notice a little more low end torque in daily driving and gettin on it. besides it will help your motor deal w/ the extra air that is coming in by not letting it lean out (this is what i have heard) you should get a sct xcalibrator 2. these can be custom tuned to your setup.