Ive been looking at the Motordyne IsoThermal Spacer and the MREV2 manifold, i also looked at the Kinetix Racing V+ Plenum and the Z1 Plenum Spacer. Which ones are gonna give the most bang for my buck? also where can i get these the cheapest.

 

You're auto, so IMO, just get the Motordyne 5/16 Iso Thermal spacer without the MREV2. You can make gains from the MREV2 still, but the gains for the price is minimal. I would avoid the other spacers since Motordyne actually offers a truly complete kit with replacement bolts, washers, additional gasket, the Iso Thermal components, and an Aramid Gasket.