For a 318 what would be best, single exhaust or dual exhaust or does it matter, motor is original with 130k 2 barrel carb. Thanks

 

It's a two barrel, It can only flow so much because it's restricted with the two barrel. Put on a aftermarket intake and a 4 bbl then upgrade the exhaust.

 

honestly i have a two barrel carb in my w150 and it first came out with a dual exhaust and it was pretty good but then i wanted to quiet it down a little so i put a single exhaust but it really dont matter the gas millage is about the same anyways.