Frets,
thank for your advice. I hope, that my exhaust will be OK. The temperature won´t be very high, because, this exhaust system will be conetct with origin silencer for DLE. Silencer is very important for 2C gas engines, because it helps with increasing power of the engine. Before I instal it into my Zero, I must test it. Maybe I will have negative effects at rpm. If this will be right and reailty I won´t use it.