OK, so I'm doing a rotary conversion on my ke20. I have a RX7 series 1 brakebooster to go in.

Ive cut away all the un-necessary sheet metal in the way. Have got to this problem, i have to enlarge the 40mm standard ke20 hole to 50mm to accomodate the rx7 booster, Just wanting to know what sort of tools i will require to achive this?

 

Or will i be beter of using a KE55 booster?

A hole saw will do it, they come in 52mm diameter.

I've used a dremel to enlarge the hole.

All sorted! managed to make it fit today with a bit of perseverance, fits in snug next to the clutch master cylinder.

 

Few more things to do an it shud be nearly ready to hit the streets