Exhaust recoomendations with reed valve

Just finishing my new engine, LML with PInasxo 17, serie pro reed crank and MMW reed block etc... My question is it essential i use an expansion pipe with a reed valve, can i use the SIP road exhaust, understood it may not gett full power but would be a better noise for the neighbour!

any reccomendations appreciated

Yes if you do not want to make too much noise but want decent performance sip road is a very good choice (but not the chromed version which is noisy).