Comparison
Pros The 2into1 has good ground clearance, great weight savings.
Cons Runs very hot by your legs, has less HP mid / max revs but has more torque bottom / mid range rpms than a 2into2. Better suited for slow riding off road.
Pros The 2into2 has around 3kgs more weight than the 2into1, has better exhaust gas flow, produced more HP from the mid range to max RPM. Removes around 7kgs compared to a standard set of cans
Cons Not many just 3kgs more weight than a 2into1.