I've got the 5/16" iso installed currently with an Osiris tune, does anyone know how that compares to the 1/2" with a tune? I've heard that before a tune they're pretty much similiar but you can pull a lot more HP with the 1/2" once you get tuned... However nothing solid.

Anyone have some solid info on this?

 

A tune wont really change the gains made by the spacer.
If you are already tuned with the osirus and have the 5/16" spacer, switching over to the 1/2" will only make the changes as shown in this plot.

http://www.motordyneengineering.com/...tAnalysis3.gif

And you definitely won't need a retune if you already have a good one programmed.

 

Yeah I was wondering this also...

 

Good to know