Quote Originally Posted by e-rue View Post
Also, what difference does it make if its an automatic trans or not? Mine is automatic (i completely redesigned the back of the 818 frame to hold a modified 4EAT) But I wasn't sure what if any difference it makes to the brake booster.
Eric
No difference in the booster, but the NC Miata uses a shared clutch/brake fluid reservoir. The Subaru WRX uses a separate reservoir for the clutch master cylinder. So for any 818, manual or auto, you want a automatic transmission NC booster/master cylinder so you get a reservoir that does not have the lead for the clutch master cylinder as well.

So there's no differences generally for automatic vs. manual brake boosters/masters but you have to keep an eye out for shared reservoirs on manual vehicles.