The B-Series Race Kit is based off of the impressive Rotrex C30-94 supercharger

On the product pages you can find a comparison of the GFB controller to other major brands

Rear arm made of high density steel

TEGIWA Aluminium Crank Pulley

Manufacturer Code FL1011VWG6-TT

Hardrace TRAILING ARM Posteriore PILLOWBAL - Subaru IMPREZA GE-GR STI 06+ LEGACY BM BR FORESTER SH SKU:8819 The B-Series Race Kit isDescription Hardrace IMPREZA 06 STI GRB LEGACY BM BR REAR TRAILING ARM PILLOWBAL HARDRACE: 8819 Pillow Ball Equipped. 2 PCS SET Version 2 Rear trailing arm made of high density steel, to provide excellent stability during high speed driving or hard cornering. . Made with high quality ultra strong steel . ED process and painting for the highest durability . Equipped with premium quality bushings . Superior strength and durability . OE direct