Comparing dual canister to single canister, a single canister will almost always have less resonance.
At the Porsche meet last weekend a guy had a Fabspeed exhaust and another had a GHL. I got to ride in both cars which were stock other than exhaust and both 2.7's, the GHL is clearly louder. The Fabspeed was also an excellent sound but, it lacked a bit of the throaty sound. The resonance was almost none compared with the GHL. The guy with the GHL said he loved it but...his wife hated it.
Is $500 good for a GHL that's been used for 5K miles?
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