13.9 is very respectable for a fully optioned non blown saleen with your mods. Btw, what was your sixty foot time, cause i can drop a 1.9 in my 99 which is mainly setup for open track events. If yours is any bit over 2.1 there is more left in your car. Did you take things out like the spare, and all the other loose crap that doesnt need to be there. I used to be all hardcore into trying to lower my times, but i have stopped drag racing all together. There are plenty of tricks probably still left if you are interested in lowering those times.
My 60 ft was 2.144 Yeah I took my spare and jack out and removed my headlight. It was 90 degrees outside. I was hoping to go 13.6 but I could tell the first run that wasnt gonna happen. Do you know how much a Saleen weighs? I wonder how much weight the kit, brakes and suspension adds? Next up is drag radials, cams, and longtubes.
Oh yeah one more thing, try lowering the psi in your rear tires a few pounds and raising them in your fronts. You will have more traction off the line and less rolling mass on the top end.