[Tigers] Exhaust flex couplings

[Smit, Theo]

http://thmotorsports.com/vibrant/vibrant-exhaust-fabrication-flex-coupli
ngs/g-50541.aspx

This reduces bending stresses, not torsional stress (unfortunately
that's probably the dominant issue with a system like the Tiger's). The
most common application for these things is on transverse engine
installations, where the torque coupling of the engine causes bending
stress on the exhaust.

Theo