@d_moss The ET stock stroke and ET 1107 10mm does not have auxiliary exhaust ports, their new ET 900X comp does though. None of DASAs cylinders have auxiliary exhaust ports.
ALL TPE engines do have auxiliary exhaust ports and also differ from all other engines by rocking as precision cast alu cylinder with nicasil plating.
You can get all the diffrent answers you want, some people swear DASA, some ET and some TPE. I think what TPE did and does is really great and is the closet thing to a real high HP "factory" engine with its design. With that being said.
If you buy the "best" cylinder/engine, i wont matter if you wont get it setup right and wont get the pump setup right for the engine setup.
I can only say i got nothing but the best service with TPE, really great service, knows they stuff and support their customers.