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They're not actually chambered per se like a Flowmaster or the likes. They are a glasspack style muffler with enlarged sections around a louvered core that act as small resonance chambers. All of their mufflers have louvered cores. That's like 1950's tech right there.........LOL. They say it's not any type of restriction, but after comparing them to Borla and MagnaFlow or even Dynomax, I don't see how it could be as free flowing. It is a good sounding system for sure. Definitely one of the bether sounding systems for this car. Fitment is generally pretty good and build quality is good too.
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2011 2SS 6A Red Jewel Metallic, Vararam Tune CAI, Magnaflow 3" Competition c/b, Speed Engineering 1-7/8 LT's, Circle D 5C, M/T 275/40R20 S/S, HPTuners tune by Ryan@GPI
12.3 @ 112 ACM as of 12/22/19
Gone on 12/28/19 R I P
2010 2SS 6M Victory Red/Black (old ride)
CAI intake, Speed Engineering 1 7/8" LT's, X4 base tune, Flowmaster Outlaw axle-back.
12.6 @ 115 SAR as of 9/19/15
Gone but never forgotten.
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