it is yes mate. H block onto a B series Gearbox thing is mate, not many people have done a H2B swap in a M, so it would definitly be different to see. and will be a good experiance in doing it. like me, i could've swapped a B18 into mine instead of a D16Z6 with some bolt on Mods Etc.. i have seen a small increase in power but not a massive amount. where as putting the B18 in i would've gained a lot more power straight away. i plan to turbo before the end of the year depending on money, which will in fact give me much more than a B18 with bolt ons. its all different peoples projects in how to get stuff done