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It's a head scratcher. I bought the mufflers used to do the gundo hack, so could be they are defective. I absolutely love the result minus the idle vibration. Nice bark when you start it up and stock quiet when cruising. Really nice sound when you get on it, not loud but sporty. Don't know where to go from here as the vibration/drone only occurs at idle when the car is in gear (tiptronic). That may be a clue as the idle drops when in gear, put it in neutral and the sound goes away. It's not a subtle vibration/drone, it is loud and quite annoying. The seats vibrate. Put the stock mufflers back on and problem goes away.
Anyone have any ideas?
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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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