I plan on doing a jdm b16 swap in my 94 civic coupe. I want to get the Rage B Series Header from KTeller but its longer than the stock header, so I will have to get a custom exhast done. My question is how big is the piping on the downpipe of the header so I know what size exhaust piping to get. Also I want to get an Apexi WS or Tanabe Medallion Touring muffler to go on it but their both 60mm inlet. Can you get a custom 60mm exhaust? I know youi should get the same size from header back but I am confused on what to get. Thanks