MCAI-$20-30 Here is the Holden Part Numbers for the MCAI 92102689 HOSE - AIR CLEANER SCOOP 92102700 SEAL - AIR CLEANER SCOOP 92096849 DUCT - AIR INLET TO AIR CLEANER can be completed in 30mins see MCAI thread for DIY. Good set of Tri Y extractors and twin 2 1/2" system $1100-1500 ( genie , Pacemaker, HM 101's, Difillpo, all good ) Mafless Tune $400-1300 Diff gears A4-3.7's or 3.9's if you don’t use the highway much. M6 -3.9's or 4.11's if you plan on Drag racing a fair bit. OTRCAI- An Over the Radiator Cold Air Induction system, Power Torque or Sureflow make Very good systems for LS1's are around $500-600 this should see you with 220-240rwkw and a 12 second time slip. Wanna Go faster ??? Stage II Auto should see you looking for a Stall converter- $1100-1400 (aka Torque converter ) a 2800 stally is the Perfect Stall for a Unopened Or baby Camed Car. Manual owners should be thinking of a Good Heavy Duty Clutch, as I Don’t own a Manual I can only go from reports But I am Told a textilla is the Best value and performance Clutch on the LS1 market.-$1200-1600?? Also on the Manual Side a Rip Shifter is going to be on your shopping list, I’ve had a Crack at a Rip shifter By GM Motorsport and WOW they are the Best Shifter I have ever used... $400-500 Cam and springs Upgrade, From all reports a 222/224/112 is the Perfect Street Cam and will suit your 2800 stally Down to a Tee and along with a set of 918 springs Should see the Power, Torque and overall Drivability Greatly Improve.. As for things Like Ported Throttle Bodys and Underdrive Pullies these are in the Next lot of Bolt on Mods and In MY opinion Should only be Considered after the Above Mods have been completed or in the case of the UnderDrives, these could be fittted at the same time as the Cam.