I just ride woods, hopefully I can run the quite core in areas that require lower db'sI am using the 16 inch but you can run either. Alot of people prefer the lower decibels, plus some tracks are starting to adopt a decible rule like the ama uses on motocross. Maybe not as strict but it's heading that way.
I think the dasa pipe is way too loud for the woods. The two brothers is a better prouduct plus two brothers has good customer support dasa has none. I have sent too motors to dan and still cant get customer service check the comments on dasa at the Yfz central site. good luckTwo BrothersDasa