NZ OSCAR Series

[Ricey88]

http://www.camsmanual.com.au/pdf/02_race/d_3rd_Category/RA22_Group_3D_Q209.pdf

(v) The mudguard and/or flare may be modified to permit the exhaust pipe outlet to pass through a cutout/relief therein such that no part of the modification is above a horizontal plane passing through the centre of the rear wheel hub.

http://www.camsmanual.com.au/pdf/10_gen_req/gq03_schedule_a_b_q209.pdf

10. fitted with sideways or rearward-facing exhaust outlets. If rearwards, the outlet/s shall be between 100mm
and 450mm above the ground and shall not protrude more than 150mm beyond the rearmost portion of the
automobile. If directed sideways, the outlet/s must be located rearward of the midpoint of the wheelbase. In
any case, they shall not project beyond the maximum width of coachwork or terminate more than 50mm
within the plan view of the adjacent coachwork;

[Nadz44]

some NZ Super Sedans that wouldnt go astray on our tracks...