Good morning, Went back to 91 octane to clean out fuel system. I ran fuel down to where it had 8 miles left in the tank. I added 5 gallons of Shell V-Power and then a bottle of Techron Complete Fuel System cleaner when I got home. Drove until tank had 17 miles left and added a bottle of Techron Fuel Injector Cleaner and 4 gallons of Shell V-Power. Drove until tank had had 15 miles left and did these logs. I added a new mod; VTT Billet BMW Crankcase Breather. Car pulls like a freight train now! How much boost can we run on 91 octane? NEW MODS: VTT Billet BMW Crankcase Breather PERFORMANCE: aFe POWER 54-76306 Momentum GT Pro 5R Cold Air Intake (urethane plug plugged in), Wagner EVO II 7inch FMIC, VSRF chargepipe, Cyba ram air, AR Design 3" inch catless dp, Circuit Werks full catless exhaust, Fuel It Stage 2 LPFP, Turbosmart Diverter Valves, NGK Laser Iridium Spark Plugs. DRIVETRAIN: 3.46 differential (from 335i Automatic)+ Wavetrac LSD built by VAC Motorsports, SPEC Super Twin Disc Clutch Kit (SB53PT-3) w/ ECS Performance Clutch Fork Pivot Pin, BMS Clutch Delay Valve Delete, Turner Motorsport Aluminum Solid Transmission Mounts TIRES: Toyo Proxes R88R {INFLATED OVERALL DIAMETER 26.3") FLUIDS: 1. Motor/turbos: Royal Purple XPR 10W40 possibly going with Amsoil 0W 40 European Classic or 5W40 European Classic 2. Transmission: Royal Purple Synchromax possibly going with Redline or something else 3. Differential: Redline High Performance Gear Oil 75W90