.From the Manufacturer

The 6 BTM is ideal for engines with a turbo or supercharger. Not only will the engine benefit from MSD’s full power CD sparks, but there is also an adjustable boost/timing retard circuit to prevent detonation.
When your supercharger (turbo or blower) forces the air/fuel ratio into the engine, the cylinder pressure inside the combustion chamber increases. The result is a great amount of power but this can also lead to detonation which can result in severe engine damage. The 6 BTM lets you dial away detonation by retarding the timing in relation to the boost pressure. By electronically controlling the ignition timing your engine can run on the threshold of detonation to obtain maximum power and efficiency.
The BTM features a dash mounted control knob that lets you adjust the amount of timing retard. It can be adjusted from 0° per pound of boost to 3° per pound. The boost pressure is monitored by a sensor built into the MSD.
The 6 BTM also shares the Soft Touch Rev Control of the 6AL Ignition for over-rev protection. The BTM is supplied with rubber shock mounts and rpm modules for 3,000, 6,000, 7,000 and 8,000 rpm.
NOTE: Not compatible with distributor-less systems.
NOTE: With an MSD 6 Ignition, some factory and aftermarket tachometers and fuel injection systems may require an MSD Tach/EFI Adapter.
FEATURES
Designed for severe racing conditions NASCAR approved & featuring NASCAR mandated 6-pin weathertight connectors Circuits encased in a silicone elastomer for incredible resistance to racing vibrations The 6TN features the same 4-pin connector as the 6T The 6ALN features built-in Soft Touch Rev Limiter and four rpm modules Ideal for engines with a turbo or supercharger Convenient dash-mounted knob to adjust spark timing retard Includes heavy-duty rubber shock mounts Includes RPM modules C.A.R.B Approved
SPECIFICATIONS
Operating Voltage: +10-18 VDC Negative Ground Current Requirements: 5 Amps-5,000 RPM, 10 Amps-10,000 RPM RPM Range: 15,000 RPM with 14.4 Volts Spark Duration: 20° Crankshaft Rotation Energy Output Max: 105-115 mJ Per Spark Weight and Size: 3 lbs, 8"Lx4"Wx2.25"H Voltage Output Max: Primary: 460-480 Volts, Secondary: 45,000 Volts (Blaster Coil)

Product Description

MSD 6462 6-BTM Ignition Control Box
.Retard the ignition timing 1 degrees-3 degrees per pound of boost, maximum of 15 degrees, with dash mounted adjustable control knob
.110 millijoules per spark up to 15,000 RPM
.470 primary voltage output to coil
.12-15 Volts, 7 Volt Start
.CARB E.O. Approved

MSD 6462 6-BTM Boost Timing Master