[Backtobasics]

I lean more to the enthusiast side of the game. Knowing the engine is an air pump, IMHO, removing restrictions on the exhaust side of the equation should increase efficiency of the pump, provided the exhaust sizing stays appropriate for the engine. 3" exhaust on a Metro would not be beneficial from a flow standpoint.

Removing resonators (extra mufflers) should reduce restriction, and increase the overall flow, which should be beneficial, provided the existing system is not oversized, and the resonators are actually putting in some needed backpressure. Since OEM's tend NOT to put oversize exhaust in vehicle from a cost standpoint, I would think it a safe move to remove the resonators for increased flow.