Correct … MCX speaks and sells the truth… all these other claims are horse poopFactory turbo maxes out at 250hp. These other claims of 270, 280... are all great on a short dyno pull but in real world riding anything over the 250 mark and you are heat soaking the turbo and just blowing hot air.
If you want more power a turbo upgrade is needed. If you aren't afraid of losing reverse could go belt drive to gain throttle response and change gearing to suit your riding style.