How do I tell what build number my SS is?

i think you can get that info off SLPs site or call their michigan office.

I've called SLP a couple times, I believe this is thier number:

1-248-288-3066

You can also go to their forums at www.slponline.com and make a post on their VIN section. They'll decode it and give you the build# and conversion date.

SLP Engineering
248-288-3888