E36 / Z3 M Coupe Front:

Large- (.188" Wall) 124% - 365% Stiffer, (24-32mm Bar Equivalent)

Medium- (.155" Wall) 104% - 308% Stiffer, (23-30mm Bar Equivalent)

Small- (.120 Wall) 80% - 238% Stiffer, (20-28mm Bar Equivalent)

 

E36 Rear:

Medium- (.095" Wall) Red, 181% - 288% Stiffer, (20-24mm Bar Equivalent)

Small- (.083" Wall) Yellow, 80% - 240% Stiffer, (16-22mm Bar Equivalent)

 

E46 / E85-E86 Z4M Front:

Large- (.188" Wall Thickness) 181% - 288% Stiffer, (29-34mm Bar Equivalent)

Medium- (.155" Wall Thickness) 143% - 238% Stiffer, (28-32mm Bar Equivalent)

 

E46 M3 Rear:

Large- (.120" Wall Thickness) Black, 120% - 320% Stiffer, Made to Order, (24mm-30mm Bar Equivalent)

Medium- (.095" Wall Thickness) Red, 110% - 300% Stiffer, (22-28mm Bar Equivalent)

Small- (.083" Wall Thickness) Yellow, 80% - 240% Stiffer, (18-24mm Bar Equivalent)

Super Small- (.062" Wall Thickness) White, 50% - 200% Stiffer, Made to Order, (16-22mm Bar Equivalent)

 

E46 Non-M / E85-E86 Z4M Rear:

Large- (.155" Wall Thickness) Red, 120% - 320% Stiffer

Medium- (.120" Wall Thickness) Yellow, 110% - 300% Stiffer