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It would be more accurate to compare performance with the OEM muffler removed, just using a premuffler or cat with no muffler. You will see the same 12HP increase. That sound arrester looks like a 2" straight pipe. Not sure how that is different than putting a tailpipe on a premuffler.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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