The passenger seat weighs about 30lbs. I dropped 1 tenth taking mine out(could have just been a better launch though). I agree with Skyler, leave the back seat in it weighs as much as a box of corn flakes.
If you can bump your timing up again to 13 or 14 do that too. Mine is at 13 and I noticed more power going from 10.
With better tires and your other mod's you should be at low 14's.
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'91 LX convertible , T-5, Centerforce Dual Friction, MSD Blaster Coil, FR 9MM wires, 13* timing, 1.6rr, ported/polished/milled stock heads, 1.94/1.60 stainless valves, March Performance Pulleys, K&N panel, 1"spacer, BBK shorties, 2 1/2" off road H, Summit 2 1/2" catback
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