wuts the difference between the dynomax ultra flow systems and their superturbo systems? which is better?

 

Ultraflow flows more and is louder at WOT then the superturbo.

 

Yep^^

Also-

The ultra flow is louder and flows 4 times (i think) better than oem. It only has a single exit tailpipe if that matters to you.

The ST has the dual outlet pipes and is quiter. It is louder and flows about 100% more than oem muffler.