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1 AFR and never requires free-air calibration when used with an AEM wideband AFR controller
Never sacrifice your towing ability
Manufactured using highest grade carbon fiber raw material
Guaranteed fit for all G80/G82 M3 and M4 models
1 (J65) 1990 Pontiac Firebird Engine: 3
BC Racing ZR-Series Coilovers (I-39-ZR) 1768 1 AFR and never requiresBC Racing's ZR Series models bring a 3 way adjustable track ready coilover system to racers at an affordable price that's never been seen in the industry. Each ZR series coilover system offers independent low speed high speed compression damping adjustments and separate rebound adjustment. They also offer full height adjustability independant of piston travel and spring preload. On cars with McPherson struts the ZR Series comes with an inverted mono
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