Spark Exhaust Force 3/4 Kit D.54 Yamaha R1 (2015-2025) GYA8828T

A complete first step: the AISI 304 stainless two-into-one manifold at 54 mm together with the 350 mm Force silencer in titanium. Spark quotes three point four kilos against eight for the standard section — four point six kilos gone, and the catalytic converter with it.

Key Features

• 3/4 kit for the Yamaha R1 and R1M: D.54 stainless manifold plus Force silencer.
• AISI 304 two-into-one collector, 54 mm.
• Force silencer, titanium, 350 mm.
• 3.4 kg against 8 kg standard — 4.6 kg saved.
• Compatible with the passenger footrests.
• Force stays within the decibel limit of the French championship and the Endurance World Championship.

The Force Case

Force is Spark's compliance silencer, and that is worth stating plainly because it is the reason to choose it over the louder cases. Spark divides its range at a line it draws itself: Force and Force Evo stay within the decibel limits required by the French championship and the Endurance World Championship; the MotoGP and Grid-O sit above them.

Noise limits on Italian and European circuits now apply to free practice days as well as to races, and the permitted level varies by championship and by engine capacity. A silencer that clears the limit without a dB killer plugged into it is a silencer that will not cost you a session.

Three Hundred and Fifty Millimetres

The Force here is the short one — 350 mm, where the D.60 and D.65 silencer groups are 400 mm. On an R1 that keeps the case within the tail rather than trailing behind it, and it is part of why this kit reads as a subtle change rather than an obvious one.

Length is also the crudest lever an exhaust designer has over noise. A 350 mm case that still clears the championship limits is doing that with packing density and internal geometry rather than with sheer volume, which is a harder engineering problem than making a long silencer quiet.

Installation

The kit replaces the section from the collector back and leaves the four standard headers in place, so nothing has to come out of the fairing. The pillion footrests keep their mountings — Spark lists this kit as compatible with them, which is not true of every 3/4 system on this bike.

Budget for new exhaust gaskets at the header joint and a torque wrench for the clamps. The catalytic converter comes out with the standard mid-section; keep it, because refitting it is the only way back to a road-legal exhaust. Spark supplies its installation sheet with the kit, and you will find it under Downloads on this page.

Fitment & Compatibility

Yamaha R1 and R1M, 2015 through 2025. The manifold on its own is GYA8828; the D.60 equivalent with the same silencer is GYA8878T. The 400 mm Force silencer group for the D.54 manifold is GYA8829ST.

Road Approval

None. The kit removes the catalytic converter and carries no EC certificate, whatever its noise level. Closed circuits only.

Specifications

• Part number: GYA8828T
• Type: 3/4 racing kit, STEP1
• Manifold: AISI 304 stainless steel, 2-into-1, 54 mm
• Silencer: Force, titanium, 350 mm
• Spark weight: 3.4 kg
• Standard section: 8 kg
• Weight saving: 4.6 kg
• Noise: within the French championship and EWC limits
• Catalytic converter: removed
• Passenger footrests: retained
• Fitment: Yamaha R1 / R1M (2015-2025)
• Road approval: None — track use only
• Manufacturer: Spark Exhaust Technology, Mantova, Italy