Bolt-ons: Engine performance

K&N stage one jet kit: £88.99

Boosts power by about 5 per cent across the rev range.

K&N High Flow air filter: £34.79

Replacement paper element improves airflow.

Pipercross air filter: £27.50

Replacement foam element is cheaper option.

AkrApovic race system: £584

Various finishes and road-legal versions available.

Micron Zeta race system: £408

Worth around 10bhp, requires carb rejetting.

CSK clutch spring set: £8.23

Heavy-duty springs are stronger than the originals.

EBC clutch plate set: £38.19

Heavy-duty, cork-based plates are less prone to wear.

Remus Grand Prix end can: £311

Road-legal, 76mm bore, titanium finish.

Remus Grand Prix end can: £291

Race only, 76mm bore, carbon finish.

Micron Delta Can: from £162.95

Road-legal, alloy or carbon finish, worth 3-4bhp.

G-Force end can: £210

Race only, carbon finish.

Harriss Exhaust Bracket: £38.25

Aluminium bracket needs you to bin pillion footpeg.