i saw that motor dyne has a kit out for a manifold and iso thermal spacer and its suoose to be guarennteed 15hp but is says its for a REVUP engine my question is wuts a revup motor I should be fine just buying a 5/16 spacer right would i have any problems with just the spacer

 

revup motors come on the 05+ 6mt's. do a search on exactly what the revup motor consists of. it's been covered several times and extensively.

if you don't have an 05+ 6mt, just get the spacer. if you do have an 05+ 6mt, get mrev2 and the spacer. easy.