Guest theprophet1978 Posted January 11, 2012 Share Posted January 11, 2012 basicaly my question is this......is there a difference and if so what? i want to keep my xr as close to standard as possible as in the long run seem to be worth more but apparently the rs has bigger bore?? just wondered if this was the case thanks Quote Link to comment Share on other sites More sharing options...
Guest Imperial Blue Posted February 2, 2012 Share Posted February 2, 2012 Yes there is, the RSi manifold has a better flow and was developed for motorsport use. If I'm correct you need a RSi downpipe to fit the manifold. The RSi head has also a better flow with round exhaust ports and solid lifters, and sharper camshaft. Quote Link to comment Share on other sites More sharing options...
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