
I. EXTERNAL ACCESSORIES: The ones under this category are present around the motorcycle, and can be seen visually. They are used to fulfill any functional purpose or to enhance looks. A few essential and most used accessories are listed below.
1. Frame Sliders

2. Swingarm Sliders

3. Fork Sliders

4. Radiator Guards

5. Swingarm Spool

6. Tank pads

7. Tail tidy kits

8. Adjustable Levers

II. INTERNAL ACCESSORIES: These internal accessories are used for performance upgrades. They have an upper hand over the stock parts. A few of them are listed below.
1. HID Lamps

*** Stock headlamps vs HID lamps
Though the stock headlights produce sufficient brightness, the HID (High Intensity Discharge) lamps produce more light per unit power when compared with tungsten/halogen lights. The HID lamps increase the visibility range and also have a higher efficacy.
2. High performance Air filters

*** Air filter box of a Yamaha R1
These aftermarket air filters allow for a better breathing to the engine, aiding to an increase in performance. They're made of an oiled cotton medium and are designed to increase the horsepower, torque and acceleration of the motorcycle. These air filters are washable and reusable, thereby saving the cost of replacing the filters on every service.
3. ECU tuning chips

These chips come in different tuning states that can be changed manually. The chips vastly increase the horsepower, torque and acceleration of the motorcycle. The latest chips also support advanced electronic components like quick shifters. Some of the famous aftermarket tuning chips are manufactured by Power Commander and Bazzaz.
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By: Aravind Rb