[TOYMAN321]

Does anyone here have any experience or opinions about flex fans? Do they help the engines performce (reduce drag enough to make a difference) at higher RMP?
http://www.perma-cool.com/Catalog/Cat_page22.html
Thanks!

 

[TOYMAN321]

do we need an adapeter (they sell them on their site) for the mkii's? what part # or size did you use... if you remember... thanks!!