Rev9 2pc Valved Side Muffler Bypass Pipe for Porsche 911 991 GT3 RS 911R 14-19 BUB Damping Levels 16-Level Height Adjustment

Damping Levels 16-Level Height Adjustment Yes Spring Rate(Front) 6 kg/mm (336 lbs/inch) Spring Rate(Rear) 5 kg/mm (280 lbs/inch) Spring Length(Front) 200 mm Spring Length(Rear) 230 mm Front Top Mount Yes

Note2: will not fit 4cyl & convertible model

durability

Spring rates: Front: 8 kg/mm / Rear: 5

Rev9 2pc Valved Side Muffler Bypass Pipe for Porsche 911 991 GT3 RS 911R 14-19 BUB Damping Levels 16-Level Height AdjustmentApplication: Porsche 911 991 GT3 GT3 RS 911R 14 19 FlowMaxx Valved Side Muffler Bypass Pipes for Porsche 991. 1 991. 2 GT3 GT3 RS models are equipped with valves offers the capability to produce an aggressive exhaust note under acceleration, and a more quiet tone for city driving. When cruising on the streets the valves are closed and produce a deeper exhaust tone. At wide open throttle the valves will open, producing a unique rich exhaust tone.