Bilstein M 9200 (Bypass) shock absorbers feature position sensitive damping and are designed specifically for professional off - road motorsports. M 9200 (Bypass) shock absorbers are available in either 3 - tube or 4 - tube configurations and include a piggyback reservoir. M 9200 (Bypass) shock absorbers are for custom fitments and are sold by length. These shock absorbers are completely owner rebuildable and revalvable. All service components are readily available and sold separately. Utilizing an M 9200 (Bypass) shock absorber is the easiest and most effective way to tune an off - road suspension for ultimate performance.