I finally have money to do some regular maitnence that hasnt been done in a long time
Here is my list of stuff i am going to get.
If you think i should get something different or there is something better out there let me know
I am still all stock

NGK TR-55
Belden Blue Wires
Stock O2 Sensor
Superstat 180 Degree Thermastat
Gatorback */C Belt
Custom CAI (not sure how to do yet,and yes i searched already, but will post something in performance)

Once all this is done what should be next high flow cat and exhaust?
How big of an exhaust should i go, since i am boosted should i get the 3" and i also am going to get a smaller pulley and a scantool in the near future. So take that into consideration.
Thx

As part of your maintenance..I may rethink those Belden wires. Recently a member ran into needing the box and receipt to use his warranty. Other branks that are available at Advance aka Checkers are AC Delco and Autolite Professionals. Checker has your phone number in their system for warranty and doesn't require the reciept/box. ( I know my box ended up in a NJ waste facility)

Consider the mileage and changing the supercharger oil/coupler. Check the fuel pressure before thinking about the smaller supercharger pulley. And whatever you do...please research that 3" exhaust a bit more. You will probably notice a loss of power as your S1 doesn't flow more than your current exhaust. One of the fastest S1'* on the club still has a near stock exhaust.

Don't even BEGIN to think about 3" exhaust until you have aggressively ported heads, a cam and rockers, and a lotta other mods.

Our 2.5" exhaust is mandrel bent stainless, with the best-flowing stock exhaust manifolds in GM history. Velocity is perfectly matched and well-set for future modding. You will hurt your performance by going 3".

that is exactly what i wanted to know