Spark Exhaust EWC Full Titanium System Yamaha R1 (2015-2025) GYA8894T

Spark introduced this system in 2023 for the Endurance World Championship, and endurance racing asks different questions of an exhaust than a sprint race does. It has to survive twenty-four hours, it has to come off and go back on during a pit stop, and it has to stay inside a noise limit that is enforced all night while people sleep nearby.

Key Features

• Full titanium D.65 system in the EWC specification Spark introduced in 2023.
• Force Evo silencer in the 350 mm length.
• 4.1 kg against 10.8 kg standard — 6.7 kg saved.
• Force Evo stays within the 102 dB limit of the Endurance World Championship and the French championship.
• Spark states the EWC version is not compatible with the passenger footrests.
• Developed for a class where the exhaust is removed and refitted mid-race.
• Yamaha R1 and R1M, 2015 to 2025.

What Endurance Demands

A sprint exhaust has to survive twenty minutes at a time. An endurance exhaust runs through the night with rider changes, refuelling and, when a crash damages bodywork, a silencer coming off and going back on against the clock. That puts the emphasis on the joints: couplings that locate the same way every time, springs that can be hooked in the dark, and a hanger that a mechanic can reach without removing the tail.

It also puts a hard ceiling on noise. Endurance events run into the small hours near circuits with neighbours, and the decibel limit is checked and enforced rather than published and forgotten. Spark's choice of the Force Evo here is not a compromise — it is the requirement.

The 350 mm Case

Spark builds the Force Evo in more than one length, and the EWC system uses the 350 mm version. A shorter case sits further from the tyre and is easier to protect and replace in a hurry; a longer one is quieter. That Spark specifies the shorter one for endurance says the system reaches its noise target through the collector and the packing rather than through sheer volume.

Where It Sits in the Range

Five full systems, all D.65. GYA8881T is the stainless-collector Force Evo and the entry point. GYA8880T, GYA8850T and GYA8871T are titanium with the Konix Evo, Moto GP and Grid-O respectively — the latter two above the noise limits. This one is the titanium collector with the compliant silencer and the endurance-derived specification, and it is the most expensive of the five.

Fitment & Compatibility

Yamaha R1 and R1M, 2015 through 2025. The bare EWC titanium manifold is available separately as GYA8894R, and the matching silencer group as G00SI39T.

Road Approval

None. Whatever a championship permits, a system without a catalytic converter and without an EC certificate is not road legal in Germany or anywhere else in the EU.

Specifications

• Part number: GYA8894T
• Type: Full racing system, D.65, EWC specification
• Silencer: Force Evo, 350 mm
• Collector: Titanium, 65 mm
• Spark weight: 4.1 kg
• Standard weight: 10.8 kg
• Weight saving: 6.7 kg
• Noise: within the 102 dB EWC and French championship limit
• Passenger footrests: not compatible (Spark)
• Introduced: 2023
• Fitment: Yamaha R1 / R1M (2015-2025)
• Road approval: None — track use only
• Manufacturer: Spark Exhaust Technology, Mantova, Italy