long as u dont rev past 8200 rpm u should b fine.....thats what im lookin to do on my ls vtec. i want the cams but i dont have the money for the valve train as well......so as long as u dnt exceede the factory redline u should b ok. the type r srpings are lighter than stock as are the type r vavles.....this is what allows it to rev a 200 rpm farther than the oem stuff. the ctr valvetrain also has ti retainers i bellieve. these are the only differences.