I agree with Westrock, your assumptions are very close. 230 crank HP will be at the limit with the supercharger you have (with good basic bolt ons). With a non intercooled MP62, and good bolt-ons (headers, intake, de-cat and walbro 255) you can see 265 crank HP, with an intercooler around 310ish crank HP.
As light as our cars are, even a 20HP difference is *very* perceptable with our cars (in the sub 350HP range).
Storm titanium 2005 Elise with carbon fiber spoiler, BWR sway bar, BOE toe links, gPan2, LidBone, sector 111 wheel studs, Grey RAC Monolite wheels with toyo R1R, Team Dynamics 1.4 with Hoosier A6/R6s, Katana2 Supercharger, ECU with 265 flash. PPE headers w/decat, CEL angle eliminator, Silent touch catback, Rear Panel Eliminator, HKS intake, V2 fuel tank, Walbro255 fuel pump. HID lights.