It could be done, but you'd end up adding more weight (ie; more parts in the exhaust) to achieve it. Plus I would imagine some minor engine mods would be needed also. Decked heads (higher compression) and timed cams should put you over 145 easy with a race pipe, mine or the full system from EBR. I don't have the resources to do full engine builds at home (well, I could, but I don't have the time) and I'd need my own dyno to do development work. I just don't see that happening any time soon. I think my neighbors would frown on full blown testing in my 2 car garage.