Where money buys speed — How fast do you want to go?

Harley-Davidson AR-98 Performance Kit *

(for 1999-2006 twin-cam engines)

After the overwhelming positive response to the AR-107 Engine Performance Kits, our dealers approached us to develop a kit to fit the 1999-2006 H-D twin cam engines. Using the same proven quality performance parts and design used in our AR-107 kit, we developed the AR-98 Engine Performance Kit and adapted those parts and design to fit the 1999-2006 H-D twin cam engines.

All components below are included in the kit.


OEM Harley-Davidson Heads hand ported by Matt Smith Racing, scanned and replicated by our Rottler 5 Axis CNC, then machined utilizing our proprietary dimple technology.


(As an option if you would prefer to have your personal heads and cylinders upgraded, please send them to us and expect a 5-10 business day turn around.)


OEM Harley-Davidson Cylinders bored oversized 3.937 inches (100 mm), plated for heat reduction, durability, and increased horsepower. Cylinders are honed to industry leading tolerances using our Rottler H-75A CNC automatic power stroke diamond-honing machine.


Arsenal Racecraft has developed a proprietary dome shaped performance Arsenal Racecraft /CP-Carrillo piston to fit the custom chambers for the AR-98 kit. CP-Carrillo is a performance leader and is number 1 in piston design.


Arsenal Racecraft has developed a proprietary performance-torque and horsepower Arsenal Racecraft/Andrews .610 lift cam for the AR-98 kit. Andrews Products is recognized worldwide as a leader in design and manufacture of performance camshafts.

Plasma Plugs

Arsenal Racecraft, in conjunction with Pulstar, has developed a proprietary plasma plug using innovative plasma-assisted combustion technology to increase horsepower and torque.


Cometic Hi-Performance Gasket Set

Valve Train

Oversize Stainless Steel Valves (1.900 intake and 1.630 exhaust both with 7mm stem), Bronze Intake and Exhaust Guides, High Performance Valve Springs with Titanium Retainers.

Push Rods

Performance Adjustable Push Rods and Chrome Push Rod Tubes with O-Rings.

*Upgrade Recommendations to get the most out of your kit:

Purchase a 55mm Throttle-Body (Fly by Wire or Cable), TTS Race Tuner, Performance Air Cleaner Kit, and Diaphragm Clutch Spring depending on what exhaust is used.


All Arsenal Racecraft products carry a 12-month warranty against manufacturer’s defects from the original date of purchase. The warranty department of Arsenal Racecraft must authorize all returns.