Questions:
1. What MPH did you run?
2. Does your car give you a check engine light? (no cat h-pipe)
3. What kind of weather did you run in?
4. Does the transmission shift sloppy or hard?
Judging from your 60 fts. you could use some drag radials. I assume your car is a daily driver, so I wouldn't go with a higher stall.
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1997 GT Flowmasters,K&N,3.27 gears
RedSOHC