Welcome fellow supercharged LSS owner. Stock these run 0-60mph in 6.9 sec and trap at around 14.9 to 15 in the quarter. They are in between a SSEi and GTP in weight. I think 3.4" pulley, PCM, intake and exhaust should put you at low 14'*. Rockers may drop you into the 13'*. A member here with a 98' SSEi had those mods and ran a 13.9. Don't look at the 2K and newer too much if you want a comparison, they are hevier than 96-99. Look at the mods on the 96-99 SSEi'* and their times to get a good idea of what you'll run.
Again welcome to the dark side.
1997 Olds LSS Supercharged. 262hp and 340ftlbs. 1/4- 15.1@ 92.04mph (stock), 2.38 60ft. Nope, I can't drive. 125,000 miles. White. Interior equipment; dual 8 way Aurora leather power seats w/ lumbar, two tone interior, theater dimming lights, CD and Cassette w/ Concert Sound III (nice), steering wheel controls, sun/ moonroof, ect. Mods: 3.5", high flow cat, 1:9s, and gutted air box w/K&N filter.
2006 Ski Doo 500SS MXZ. The 500 with the 600 motor