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I have the borla s axleback on my l99. It is a great improvement in sound and weight over the oem mufflers. The only thing I do not like is when the afm (4 cylinder) kicks in it sound like a 4 cylinder. You have to run with tap shift or do a tune to get rid of afm to get around the 4 cylinder sound. Hope this helps. Right now I am using the pistol grip tap shift shifter to keep from hearing the afm sound.
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