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From my understanding, the factory mufflers are not all that restrictive.
Dynomax Ultraflow mufflers are just about some of the best flowing mufflers out there. So would anything else that is a straight through type of design (i.e. certain Magnaflows). Stay away from Flowmaster if you are looking for flow.
Dynomax Ultraflow mufflers are just about some of the best flowing mufflers out there...
I used to think so and when I installed them that was the common consensus, however evacuation tests show that they are below what I think a good system could be, so I'm asking for alternative recommendations.