Quote:
Originally Posted by iFeend
i've seen a lot of people with the motordyne 5/16 spacer. there are so many different ones (basic, iso thermal, etc). what is the difference between them and what do they do?
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Just get the basic one, copper ISO gives you "1 extra HP" for $100+ extra. The copper ISO is supposed to be better during extremely cold weathers but it's probably not worth the $100 extra