Far to many to choose , V12 merlin’s , detroit diesels , Ducati 851 & 888 on race exhausts at early 90’s BSB rounds & the JPS norton rotarys , kawasaki KR1S , aircooled YZ490’s , my old V6 alfa , big chuggin bin o **** Harley’s , small block chevy V8’s , V4 yamaha outboards , I love em all & loads I’ve forgotten.