Surge Tank
An essential component responsible for generating the engine’s tone, the surge tank, has been carefully tuned to achieve optimal acoustics. Borrowing from the design of an actual musical instrument, the sides have been made rigid and horizontal ribs have been added at the forward half to obtain a more powerful induction sound.
After combustion, exhaust exits the engine’s left and right banks through separate equal-length, large diameter exhaust manifolds that not only enhance torque levels, but also create a crisp sound quality. After passing through the catalytic converters, the dual exhausts flow through twin sub-mufflers and then meet at the rear of the vehicle in a multi-stage titanium silencer positioned behind the rear-mounted gearbox.
The titanium rear silencer incorporates a valve-actuated structure that channels exhaust flow according to engine speed. At 3,000r.p.m. and below, the valve remains closed to route exhaust through multiple chambers, ensuring the exhaust note remains civilized. Above 3,000r.p.m, the valve opens to allow exhaust to pass through a single chamber and enter the world in the form of a hi-octave soprano.
The engine’s induction and exhaust sounds are carefully channeled into the LFA’s cabin. The main channel runs from the surge tank into the cabin below the main dash panel. This is complemented by two further channels-- one at the upper cowl opening and other at the lower reflector. These sound channels ensure the driver sits at the center of a 3-D surround sound concert of engine performance.