[Rated M Roadster]

Sorry beta, but I wish you understood the concepts without having to google everything. I was waiting for: the boost loss could be easily remedied with a pulley change, etc. Both systems have heat soak, but I'll take the air to water especially in the cooler winters where I live. As for the space problem, ess charges an additional $2k for the Z4M kit versus the E46 M3 kit because of different intercooler piping, etc. so for $2k extra, would you pick ess over VF? That's what made my decision for going with VF very easy.