Every racer i have talked to top level or beginer is disapointed with the 353 and 359 combo packs. I just think it will ristrick sales drasticly I know i would not have any hesation about paying good money and buying one of these packs if it was minus the ns12p or ns21p engine but included a pipe and header or some kind of pack like that or even just the engine by its self. I think sales would dubble over night I'm quite confadant of that. Regards Jeremy.