Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to improve your motorcycle's performance [title] Install aftermarket exhausts. [step] Installing aftermarket exhaust kits not only gives your bike an improved airflow and aggressive sound, it also improves its horsepower, throttle response and torque. [title] Install adjustable suspensions.

Ending1: [step] Improve your bike's handling by having adjustable suspensions installed by a professional. This upgrade provides the ability to have the compression and damping settings adjusted to the rider's weight and riding style. Ending2: [step] Adjustable suspensions allow you to build up air in the entire bike, which is the result of increased bulk. You can make adjustable suspensions out of bikes equipped with pedals or a range of coverage, and it is more effective with older bikes with gears, racks, and springs, because it takes more room for them. Ending3: [step] Adjustable suspensions give you speed, nitrous control and fuel efficiency. You can find adjustable suspensions in models purchased by bike shops or online. Ending4: [step] Adjustable suspensions are saws of the same specifications divided into two sizes. Your motorcycle will usually have three different sizes, but they are fairly rare and in some cases they are kept in pairs.

Answer format: ending1/ending2/ending3/ending4