I use to think the L4's had the better tube cooling, but all it is is quieter air flow. Not really adequate actually. The L7's dropped the pressurized concept and went with the SB220 method. It just blew the air across the naked tubes. It might be louder but its simpler and more effective. I have the L4B, wouldn't mind having a L7 either.
 
This has been a good thread.

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