Name: Buell 2007 LIGHTNING
Brand: Buell
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2007 Buell Lightning: Electrical 7-19

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INTERACTIVE EXHAUST SYSTEM 7.6

GENERAL

NOTE

The interactive exhaust system is standard equipment on the

XB12 models only.

See Figure 7-21. An electronically controlled actuator opens

or closes a butterﬂy valve (1) that controls exhaust ﬂow in a

multi-chamber mufﬂer.

The ECM monitors engine speed and throttle position while

alternating ﬂow paths between the chambers to adjust back-

pressure optimizing torque and horsepower for the riding con-

dition.

For example:

1. At low RPM with a wide-open throttle, the valve (1) is

opened to reduce back-pressure so the engine can gain

RPM quickly. The exhaust enters (2) the mufﬂer and

ﬂows (3) through the open valve (1) into chamber C (7)

and then exits (8).

2. In the mid-range, the valve is closed to increase acceler-

ation torque. The exhaust ﬂows (4) through chamber A,

around to chamber B and then through chamber C and

exits.

3. At high RPM, the valve opens again to maximize horse-

power. The exhaust enters (2) the mufﬂer and ﬂows (3)

through the open valve (1) into chamber C (7) and then

exits (8).

Figure 7-21. Interactive Exhaust System Mufﬂer

10568

1. Butterﬂy valve

2. Exhaust in

3. Valve open (exhaust ﬂow - chamber C)

4. Valve closed (exhaust ﬂow - chamber A to B to C)

5. Chamber A

6. Chamber B

7. Chamber C

8. Exhaust exit

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Buell 2007 LIGHTNING Specifications

General