5.8 Exhaust systems :
5.8.1 With the exception of incidental leakage through exhaust joints (either into or out of the system), no fluids, other than those which emerge from the engine exhaust ports, may be admitted into the engine exhaust system.
5.8.2 Engine exhaust systems may incorporate no more than two exits, both of which must be rearward facing tailpipes, through which all exhaust gases must pass.
5.8.3 The last 100mm of any tailpipe must in its entirety :
a) Form a thin‐walled unobstructed right circular cylinder whose internal diameter is no greater than 75mm with its axis at +/‐10° to the car centre line when viewed from above
the car and between +10° and +30° (tail‐up) to the reference plane when viewed from the side of the car.
The entire circumference of the exit should lie on a single plane normal to the tailpipe axis and be located at the rearmost extremity of the last 100mm of the tailpipe.
b) Be located between 250mm and 600mm above the reference plane.
c) Be located between 200mm and 500mm from the car centre line.
d) Be positioned in order that the entire circumference of the exit of the tailpipe lies between two vertical planes normal to the car centre line and which lie 500mm and 1200mm forward of the rear wheel centre line.
5.8.4 Once the exhaust tailpipes, the bodywork required by Article 3.8.4 and any apertures permitted by Article 3.8.5 have been fully defined there must
be no bodywork lying within a right circular truncated cone which :
a) Shares a common axis with that of the last 100mm of the tailpipe.
b) Has a forward diameter equal to that of each exhaust exit.
c) Starts at the exit of the tailpipe and extends rearwards as far as the rear wheel centre line.
d) Has a half‐cone angle of 3° such that the cone has its larger diameter at the rear wheel centre line.
Furthermore, there must be a view from above, the side, or any intermediate angle perpendicular to the car centre line, from which the truncated cone is not obscured by any
bodywork lying more than 50mm forward of the rear wheel centre line.
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