Used exhaust camshaft, Mazda MX-5 & Eunos Roadster mk1, 1.8.
This is the cam needed to perform the much documented Exhintake modification, where an exhaust cam is used in place of the intake cam by providing slightly more duration and lift.
This modification, if installed correctly, can achieve around 15bhp and 8lb-ft.
UM00280ex.