Another vote for Dynomax here. I run a 2.5" dynomax catback with 2.5" off road H-pipe with stock headers and my system sounds meaty but not real loud. I think it's quieter even than the MAC system (especially compared to Hammers Yellowjacket, who has a MAC system).
The dynomax system is cheap and my car has a good low grumble to it.
Good bang for the buck if you ask me.
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