Spark Exhaust Grid-O Full Titanium System Yamaha R1 (2015-2025) GYA8871T

The loudest full system Spark builds for the R1, and the company says so itself. Spark divides its silencers for this bike into two groups: Force and Force Evo stay within the decibel limit required by the French championship and the Endurance World Championship — MotoGP and Grid-O sit above it. This is a Grid-O.

Key Features

• Full titanium D.65 system with the Grid-O silencer.
• Above the 102 dB ceiling of the French championship and the Endurance World Championship, per Spark.
• Grid-O is the muffler Spark supplies to Moto2 and Superbike grids.
• Mesh end cap and unpolished TIG seams — the design signature.
• Titanium collector, 65 mm, developed with international championship teams.
• Yamaha R1 and R1M, 2015 to 2025.

Read This Before You Order

A Grid-O is a wonderful thing in the right place and an expensive mistake in the wrong one. European circuits enforce their own static noise limits, those limits move from season to season, and enforcement happens at the gate rather than in a discussion afterwards. Spark's own positioning of this silencer — above the limit of two named championships — is about as clear a warning as a manufacturer gives.

If your riding is in a series or a country with no ceiling, this is the least restricted exhaust on the page. If you cannot answer that question with certainty, the Force Evo version GYA8881T or the Konix Evo GYA8880T will keep you riding.

On the Weight Figure

We are not quoting one. Spark's own site lists this code with two different weights on two different pages — 3.5 kg against 10.0 kg on one, 2.9 kg against 10.8 kg on another. Both are the manufacturer's own numbers and they cannot both describe this system.

Rather than pick the flattering one, we would rather say plainly that the figure is unreliable. What is certain is that this is a full titanium system on a D.65 collector, and the comparable titanium systems for this bike sit at 3.5 kg against a 10.8 kg standard exhaust. Ask us if you need a confirmed number and we will put the question to Spark.

Why the Welds Stay Visible

Spark leaves the TIG beads on the connecting pipe unpolished, and describes the welds, segments and cones as anything but aesthetic quibbles. Each seam is where two calculated sections meet — a cone that redirects gas more efficiently than a bend of the same diameter would. On the Grid-O the same logic runs through the silencer case, where the seams are equally on show.

Fitment & Compatibility

Yamaha R1 and R1M, 2015 through 2025, and the MT-10 and MT-10 SP, 2016 through 2026 — Spark lists this part for both. On the same D.65 titanium collector Spark offers the Moto GP silencer as GYA8850T — also above the limit — and the Konix Evo as GYA8880T, which is not.

Road Approval

None, and at this noise level that is not a paperwork detail. The catalytic converter is removed, no certificate exists, and the system is audible well beyond the circuit boundary.

Specifications

• Part number: GYA8871T
• Type: Full racing system, D.65
• Silencer: Grid-O, titanium, visible TIG welds
• Collector: Titanium, 65 mm
• Weight: Spark publishes conflicting figures — not stated here
• Noise: above the 102 dB French championship and EWC limit
• Catalytic converter: removed
• Fitment: Yamaha R1 / R1M (2015-2025), MT-10 / MT-10 SP (2016-2026)
• Road approval: None — track use only
• Manufacturer: Spark Exhaust Technology, Mantova, Italy