I have a 10th ae rx-7. As many of you know, I thought some of my coolant was leaking through the engine seals into the rotors and then out of the exhaust. I bought a tester that sences if the coolant is doing just this and it said it was not!!!!! This brought up my confidence. This weekend I plan to do a compression check and am a bit nervous. The engine was rebuilt and now has 40,000 miles on it. If compression checks to be ok, my origional plan of putting a SAFC, downpipe, and fuel cut controller on will be a real option. Keep your fingers crossed everyone