well ~ same reason i am sticking to my car "as is" to hopefully make the most of it. Im not the best but like anyone with practice getting better and faster.
Mind you , im sticking with RE001's until maxing out (at a guess 1.15s) then plop on these semis i have hanging around. Best of luck dude the B18c7 is a great reliable engine if you dont mod it too much ehe.