MX5 build engine cooling

[PorkChop]

You mean a coolant reroute?

Loads of (mostly tuned) MX-5s have had this done to improve cooling on the number 4 cylinder. There were a few group buys on MX5Nutz (which I linked to on here when those group buys were live) where you could buy a reroute spacer and a blanking plate. Unless you were going to tune the engine or do lots of track days, it might be one of those things tha's nice to have but not essential. The Ma5da race cars for example, use the standard cooling system in its entirety AFAIK.

HTH