Well I've decided to go just 5/16" iso
 

Yip, I've decided to just go with the 5/16" iso thermal spacers instead of the combo due to having non-revup and not wanting to spend the $$ on the AFR fix right now.

Good deal . . . Keep us informed on your post install experience(s). ;)

I will, and I might within a few months install MREV2, see what kind of difference there is, and then tune and see again the difference and post the results of intake/exhaust, intake/exhaust/spacers, intake/exhaust/spacers/MREV2, and intake/exhaust/spacers/MREV2/tune on the non revup. That is, if I decide to do that. I'll also post up dyno results as well.