I have been looking at Mace's comp cams for a while, I am looking to install your stage 3 cam and know that I would need tune so where could I get a custom tune to suit?

Depending on where you're located, we may be able to recommend someone who could help. If you're planning on installing our Stage 3 COMP Cam to suit an ecotec, it will run but won't be very driveable. However, it should be good enough to drive to a local tuner.