ULTRA RACING 2× 4-point side floor braces for Mazda 3 09+ BL

The side floor braces mount under the car along the sills and stiffen the floor between the front and rear axles, so the body twists less along its length under load.

Fast cornering, hard braking and hard acceleration move the weight of the car around and twist the body – in a corner one side can carry up to three times the force of the other. A twisting body changes the suspension geometry, the tyres lose grip and the car starts to understeer or oversteer. ULTRA RACING braces stiffen the body exactly where it twists most.

• Vehicle: Mazda 3 09+ BL
• Mounting points: 2× 4
• Supplied as: 2 pcs (left and right)
• Material: steel – tubes with 1.2–1.6 mm wall, brackets from 4–5 mm steel plate

Before series production the manufacturer tests every design on three jigs – compression, torsion and flex – and then on track. The braces are designed to hold the geometry in road and track use but to crumple in an impact.