Yes the subframe had to be notched. Depends on where your header ends up. There are other things that come up like engine position. Right now my throw is really long and vague and it doesnt shift over 7500 rpm. I am still trouble shooting it. Functional though. I think that is an issue particular to my car as I know others e153 shift arguably better than stock and all the way up to redline.Did you cut the frame to install e153 trans?
I think for a pure race car the sequential is fastest/best having drove all three trans options myself. I'd rather have the e153 or c64, especially a c64 that never breaks, for a street car but I have drove the sequential on the street, not for the faint of heart. It does not have synchros.