First of all, welcome to the forum.
Now gettin' down to business.....
Your first mod should be the 180° Thermostat, and ANOTHER Tranny cooler. Before anything else, bar none. These things run hot, and before 'boosting' anything else, cool it down. Save your engine and tranny.
Intakes - theres only one intake known to me SPECIFICALLY made for the Bonneville and designed by a Bonneville owner. www.angryducktofuracing.com
Click on products, engines, intakes, then CAI and ADTR. Hector is the owner, and he'* one of our moderators. Mine will be here next week, and will be the first install in a Series I motor like yours. Stay in touch for results.
There are chips available, and a bit of controversy about them all. We have 2 users running superchips, and one running Jet. My Jet will be here today, hopefully, and will be installed this weekend.
Gotcha on the pulley. The 96 is the first year of the Supercharged Series II motor, which is well supported in the pulley department because of the popularity of the Grand Prix. However, there IS a pulley available for ours. www.scperformance.com
BTW, we have the M62 Eaton blower, and the Series II has the Eaton M90.
Exhaust, you nailed.....sort of. ADTR is working on an exhaust setup, and is looking for a Bonneville in So. California to test it on before making it available. Other than that one, you ARE looking custom like the rest of us. I'd wait and see what Hector comes up with.
The basics? Stay away from Anything Bosch. NGK is great, some guys swear by the Iridiums. Stock AC Delco would also be a good choice. Custom wire sets can be had, too.
Wanna get gnarly? Check out www.domesticperformance.com
for some serious stuff, including transaxles and motors. Also check the links section on the header bar. Engine internals for our cars are a direct swap with the GP community. Same drivetrain. Rockers, lifters, cams, all that stuff, and readily available.
Blower swap is out of my league. With the potential already in the Series I with the M62, I'm not sure I'd attempt it, but you may have a bigger budget than me
Water injection? A pet project, but it did get me an additional 2 pounds of boost. There are commercial units available, but if you've read my info on it, I'm taking advantage of the air compressor already in our cars for a pressure source. It'* not something you will probably run every day, just when you're out hunting
NOS? Ask Drifter
He loves to talk about it, and has done some diggin along those lines. I think he'* still considering a system in the spring.
You'll find alot of help here. I did. Everybody here has their own area of expertise. This is where I learned everything I just shared with you. A lot more info can be found up in the Techinfo link on the header bar, also. Work in progress.
Stock performance times for the 1994 SSEi should be about mid 7'* for the 0-60, and high 15'* for the 1/4.......but a LOT of potential. Probably alot more than you expected. One of our members is spanking GP'* with a 2000 SSEi at 12.192 1/4.
Good luck, and keep us posted on your progress!