if you live in a cold area get the strongest battery that will fit in the tray.
mazda doesnt rx7 anymore :(
a GM V8
A 86 rx7 has a 13b wankel rotory engine only the turbo edition was turbo charged
left side kick panel
205 / 55 / 15 or 185 / 70 / 14
tool
A second gen Rx7 would be much faster.
not sure what year you have but on 1986-1991 it is on the ignition coil closest to the battery
wat
go to rx7city.com - just search it in googla and to to the tech connect section and there will be a manual you can download.
the plastic shield that covers the bulbs has screws that you can access with no trouble at all.
you can put almost any car engine in any decent sized car. but yeah another rotary would be your easiest choice, and wouldn't require any front suspension upgrades