RE: New ZDZ-80
I used a 28mm header , 5"long and a 30mm inlet JMB can for 210 ZDZ.
KS parts will make this this.Also---Ihave tried KS cans -on various length headers and flown em quite a bit
Theyare quiet but not as quiet as the JMB also unless they have a foot of header -they would not equal the JMB performance wise.
I have two KS sitting in my "barrel o pipes " for precisely that reason. Ikeep em for tests against other systems, just to make sure I get a total look at what works best for a particular engine setup