Parts
Every build comes down to the same fourteen decisions, in a different order. Each category has its own page: what the upgrade gets you, the brands from budget to premium, and typical street prices.
Fourteen decisions
This isn't the order to buy in — each bike's page has its own street and track order. Stock is a starting point; this is the map.
Exhaust
The first mod on almost every build. A slip-on trades the stock muffler for sound and less weight; a full system replaces headers to tail and chases actual power. The ladder runs from a $250 budget slip-on to a full titanium GP-style system.
11 partsTune
ECU flash or piggyback fueling — the unlock for everything upstream of the throttle. Mail-in services remap your stock ECU, DIY kits let you flash at home, and a piggyback bends fueling without opening the ECU at all. Air filters ride along here.
14 partsSuspension
The upgrade that makes the bike better everywhere, forever. Springs matched to your weight first, then cartridges and a shock when you outride the stock internals. Steering dampers and triple clamps live here too.
14 partsBrakes
Pads, braided lines, and a radial master cylinder — roughly in that order of cost, and close to that order of feel. Rotors and calipers are the deep end for riders who cook the stock hardware.
13 partsTires & Wheels
The only parts touching the road, and the purchase you'll repeat most. Hypersport street rubber, trackday DOT-race, or slicks — plus the wheel upgrades (forged aluminum, forged magnesium, carbon) that make every tire work better.
8 partsLevers
Adjustable, foldable, crash-replaceable — the $200 mod your hands touch every second you ride. Lever guards for track days live here too.
9 partsRearsets
Adjustable footpegs that buy cornering clearance and put your legs where they belong. Race seats, seat cowls, and seat foam ride along here — the whole rider triangle below the bars.
8 partsClip-ons & Throttle
Clip-ons set your wrist angle and drop; a quick-turn throttle shortens the twist to wide open. Grips and bar ends finish the cockpit.
10 partsCrash Protection
Frame sliders, engine case covers, axle and tank sliders — the parts you buy hoping never to use. Most track organizations require case covers before they'll let you grid up.
9 partsTail Tidy & Billet
The fender eliminator is the first cosmetic mod on almost every bike — the stock plate hanger is the ugliest part they sold you. Integrated tail lights, LED signals, bar-end mirrors, and the billet hardware that finishes a build all live here.
12 partsBodywork
Race glass for the track, carbon for the street, windscreens for both. Fairing kits turn a street bike into a crashable track bike; carbon pieces, windscreens, and tank grips dress and protect what's already there.
6 partsQuickshifter
Full-throttle clutchless upshifts — strain-gauge kits for bikes that never got one from the factory, autoblippers for clutchless downshifts on the way back.
8 partsDrivetrain
Chain, sprockets, and the 520 conversion — the cheapest 'feels faster' money in the catalog. Minus one front or plus two rear wakes up gearing that was chosen for a brochure top-speed number.
10 partsElectronics
The data and display layer: gear indicators, lap timers, GPS dataloggers, race dashes, and the small modules — speedo correctors, brake-light flashers — that make the rest of the build behave.
Prices are typical US street prices at publish time and drift with sales and supply — verify at the retailer. Fitment is advisory: always confirm the exact part number for your year, generation and market before buying.