I don't know much about aftermarket exhuast systems. Need to know the beneifits of drypipe compared to wet. What do you gain with water injection? I have a mildly modified Yamaha SN SJ, with a 6M6 engine bored to 701cc, and ported, and carb modified by group K, lightend flywheel and have MSD CDI, what exhaust do I need, have been told coffmans, but what kind. I am far more concerned with low end braaaaap.