I am not sure about a drop in power, but the SMG surely takes longer to shift above 8000 RPMs.
Ahmed and Hasan, I just noticed your responses to raising the rev limiter, I just wanted to clarify that raising it does help in minimizing the amount of shifts but that depends on what speed you are doing the runs at and probably what mods you have but I also noticed no difference in SMG shifts as I did a few vbox runs and the lag time is the same at 8000rpm or 8600rpm, again maybe this is also mod dependant.
335xi I wish you the best in getting this issue resolved quickly
2006 Low Compression Supercharged VT2-650+ BMW M5
Performance: ESS Supercharged VT2-650 / Custom ESS Alpha N Tune / Sprint Booster V2 / RPI GTS Exhaust / RPI SV1 Oil Cooler / RPI Jet Hot Coated Headers/ Howerton Engineering - Aquamist HFS-3 Methanol Injection System.
Engine: 10.1:1 Low Compression Engine Build / Mahle Custom Pistons / Carrillo Rods / Custom Fuel System / Custom Rod Bearings.
Suspension: KW V3 Coilovers / Dinan Rear Sway Bar / Dinan Front Roll Control / Dinan Monoballs.
Handling: Daily Setup: 3 Pc ADV.1 05 wheels F 20x9 / 255/35/20 R 20x10.5 / 295/30/20 / Michelin PSS Tires / 12mm Rogue Engineering Spacers.
Track Setup: Apex Arc-8 wheels F 18x9 / Hoosier A6 P245/40ZR-18 R 18x10.5 / Hoosier A6 P315/30ZR-18.
Exterior: Vorsteiner Rep Hood / Gloss Black Roof Wrap / Smoked LED Side Markers / Limo Tint / Custom Headlights with Orion V2 Rings / LCI Fins / LCI Clear Eyebrows / Custom Blacked Out LCI Tail Lights and Miranda Bruce V6.1 Cables / Hartge Rep Urethane Front Lip / AC Schnitzer Roof Spoiler / Matte Black Kidneys Grills / Gloss Black Side Gills / Gloss Black Rear M5 Emblem / Black/White CF Hood &Trunk Roundel / Rear Bumper Mesh / M5 Puddle lights / Electric Fold Away Front License Plate Frame / CF Rear Diffuser / CF Side Skirt Extensions /CF Rear Side Extensions.
Interior: White LED Interior Lighting / Black/White CF Steering Wheel Roundel / Alcantara-CF Flat Bottom Steering Wheel / Handbrake Handle/Pedals / Hardwired Valentine 1 / P3Cars BMW E60 Vent Integrated Digital Interface / Custom SC Kit Color Scheme.
Programming: Mirror Fold-up / Window Roll-up / Sunroof Closure / Auto S5 at Start up / Euro Launch Control / iDrive Acceptance Delete / Rev Limiter 8600 / Top Speed Limiter Removed.
Braking: RDSports 6 Piston F 380/35mm and 4 Piston R 380/32mm Big Brake Kit.
Misc Upgrades: Soft Close Doors / HUD/ Active Seats.
The journey continues......
Dynojet 698rwhp / 498ft lb trq.
Old 60-130mph 8.29secs....new time to come.
2001 Porsche 996 Twin Turbo, GT3 rear sway bar, Rennline CF front strut bar, Tarrett drop links and toe links, GT3 control arms, BC coilovers, Sharkwerks EVOM tune, RPi exhaust, Sharkwerks sports clutch, HRE 540r wheels, K16 Billet turbos, GTRS Intercoolers: 535rwhp, 550ft lbs trq.
2006 BMW M5 VT2-650 low compression supercharged: 698rwhp on Dynojet.
2013 Audi S5 Completely stock for now 2004 Infiniti G35 APS Twin Turbo with built motor and fully built transmission. 520rwhp and 550ft trq. SOLD but not forgotten