Not Ranked
JAM,
Did you ever get the Dynomax's? Do you know if they are perforated or louvered?
Exhaust is a complicated subject and most of the posts are musings on only one aspect at a time - scavenging, gases heating, cooling, pulsing, spiraling, backpressure, etc. The cam, timing, CID, aspiration, etc. all affect the exhaust - no two cars are alike.
Other factors also come in to play as well - ambient muffler heat, header/collector heat, styling, cost.
Tough subject. Maybe the only way to make the decision is to make a flange so that different pipes can be installed easily for different moods.
I am no closer to a decision now than when I started on this topic.
Brian
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