I doubt the rear seats really add any rigidity? I would have thought that as they're only clipped upright in one place with no upper bracing/paneling it would make no difference in removing them.

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Have Got ~ PlayMINI Exhaust, Dave.F Hybrid Air Filter, Custom BBR I/C Intake, Paul Martin & AndyH Detail, JCW AeroKit Front Bumper and Side Skirts, JCW GP Rear Bumper Trims, Aero Grill.
To Get ~ , 11% or 15% Reduction Pulley & Janspeed Manifold