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Push in the clutch.
Popping on decel is a function of the CIS combined with freer flowing muffler. The C in CIS stands for Continuous, the injectors will continue to flow as long as the air metering plate is raised. If you allow your engine to engine brake by not clutching during decel the extra unburned fuel will ignite in the muffler. If the muffler is free flowing you will hear the explosions. Stock mufflers mute this with all the packing, baffles and catalytic converter on those cars so equipped.
The idle bypass valve helps mitigate this phenomenon, the burbling becomes more pronounce if that valve is defective or removed.
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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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