Indeed. Or Motordyne CBE, and the FI CBE... There are 3 options in getting HFC's working with headers. I recommend something with 18" resonators for the rasp. Motordyne's exhaust doesn't rasp with anything. I think they made a deal with the devil
My setup only rasps very very little when cold, then goes away when warmed up.
Someone needs to buy these and use them. I love mine so much, I went twin SC just so I can keep them on!