had the 400x fitted today with all the other supporting mods on the car going from fpm375 to 400x shockingly fast even from standstill it pulls hard , mid range you have to have a firm grip on that steering wheel really impressed well done the mountune team
After a full Mountune engine rebuild last year (original engine self-destructed on track), the car has performed well on track days with the M400 map. Last month the map was upgraded to M400X which impressed straight away on the drive home, matching 2 bikes off the lights until I backed off – pretty sure it wouldn’t have done that before! The proper test is now complete following a track day at Donington. The amount and spread of torque across the rev range is incredible compared to the basic M400 map. The power delivery gives you the impression it has around 450-475BHP, in fact it is so good that I believe any more power would ruin the balance of the car. Mountune have definitely hit the sweet spot with this conversion, turning this RS into a track beast! Roll on the next track day.
Had the M400X flashed today in conjunction with 500 mile oil change post forged internals fitted last January. Steady driving for next few weeks before I can unleash the beast.