ONE OF THE KEY THINGS ABOUT MAZDA RX7\'S IS THE FACT THAT THEY ARE HEAT MONSTERS IF I WAS GOING TO DO A REBUILD I WOULD START OFF WITH CERAMIC COATED APEX\'S THEY WILL LAST LONGER THAN JUST THE ORIGINALS ALSO ANOTHER KEY IS THE BREATHING AND THE EXHAUSTS SYSTEM. MAKE SURE THAT IF U ARE GETTING SOMEONE ELSE TO DO THE JOB THAT THEY USE NEW PARTS THAT THEY DON\'T MIX AND MATCH BECAUSE I HAD GOTTEN BURNED THAT WAY. GOOD LUCK ON YOUR REBUILD SINCERELY IZ......