I liked the sound of my flowmasters with everything else stock. It wasn't much louder at idle but when you get on it everyone would turn to see what the hell was making all that noise And I even set off car alarms just turning the car on too...I've also heard good things of JBA and Magnaflow...
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I plan on putting on the Steeda axle backs, I like the straight tip vs the dual wall or rolled edge. And I have revieved good feedback, no drone and sounds deep.