Slant Six Dual Exhaust

IMO, smaller cubic inch engines respond better to a good single exhaust. If you are going to run set of 6 into 2 headers, you should look at this:

http://www.flowmastermufflers.com/?page_id=451&partno=Y214300

Two 2.250 pipes in and one 3.00 pipe out. Those Flowmaster scavenging Y pipes work very well, probably better than a set of duals IMO.