1/4 mile time drop after mods?

I went to the local track this weekend and the best i could do was
15.3 with 2.4 60 foot my previous best is 15.22 with a 2.3 60 foot.

since last time at the track i droped the air pump and put a shirt belt on, bolted on flowmaster cat back system, new plug wires. still have stock 2.73 gears(will be changing to 3.55 or 3.73's soon).

Why the slower times with mods? my 60 foots are worse aswell.
I have traction problems aswell tried launching differnt rpm's, cant find the sweet spot. How can i get better traction without slaping on slicks?I have 255/45-17's on rear 245/45/17's on front, I would like to be in the 14's before i do the gears.

The smog pump probally only took 1/10th hp to run, and when you meant short belt, what else was bypassed.I used to run a shortbelt bypassing the smog and P/S and dropped .2 down the 1/8th

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I just took off the old air pump and by passed around it. I didnt think it was possible to bypass power sterring on non a/c car?