Spark Exhaust Force Evo Silencer with Heat Shield Yamaha R9 (2025-2026) GYA8801ST
02 · Data & docs

The facts.

Technical data
Part numberGYA8801ST
TypeSilencer
Silencer designForce Evo
MaterialTitanium
FitmentYamaha R9 (2025-2026)
Road approvalNone — track use only
OriginMade in Italy
DescriptionThe whole story

The Force Evo silencer group as supplied with Spark's World Supersport system for the R9: silencer plus the heat shield that Spark calls the carter. Sold separately for riders who already own the Spark collector, or who want to change the character of an existing system without replacing the pipework.

Key Features

  • Force Evo titanium silencer with carbon end cap, supplied complete with its heat shield.
  • Approved for World Supersport competition.
  • The rib along the titanium case is structural as well as visual — it stiffens a thin-walled shell.
  • Bolts to Spark's R9 collectors; not a stand-alone slip-on for the standard exhaust.
  • Titanium sleeve, perforated inner tube and inner end cap.
  • Made by Spark in Mantova, Italy.

Build Quality & Materials

The Force Evo is the more restrained of Spark's two current race silencers. Its case is titanium with a single rib running the length and converging into the carbon end cap, and everything inside — the perforated tube, the inner cap — is titanium too, which is where the weight advantage over a steel-cased muffler comes from rather than from the visible shell alone.

The heat shield is included, and it is not cosmetic. On a race bike with rearsets, the shield is what stops a boot making contact with a component running at exhaust temperature. Spark supplies it as part of this group precisely because fitting the silencer without it is not a sensible option.

Performance & Sound

Force Evo is the silencer Spark chooses when a series enforces a decibel ceiling. On the R9 Supersport system it contributes to the 102 dB at 5,000 rpm and 103 dB at 6,000 rpm Spark measures for the complete assembly without a dB killer. Fitted to a different collector those numbers will differ, so treat them as the system figure rather than a property of the silencer alone.

Fitment & Compatibility

Designed for Spark's R9 collectors GYA8801 and GYA8802. It is not a slip-on for the standard Yamaha exhaust — the inlet is sized for Spark pipework. If you want a quieter option, Spark builds the same silencer in a 400 mm case as G00SI44T.

Road Approval

No EC approval. This silencer group is a competition component and is supplied for closed-circuit use.

Specifications

  • Part number: GYA8801ST
  • Type: Silencer group with heat shield
  • Design: Force Evo
  • Material: Titanium case, carbon end cap
  • Heat shield: included
  • Homologation: WSSP-approved competition part
  • Fits: Spark R9 collectors GYA8801 / GYA8802
  • Fitment: Yamaha R9 (2025-2026)
  • Road approval: None — track use only
  • Manufacturer: Spark Exhaust Technology, Mantova, Italy
FitmentWhich bikes this fits
  • Yamaha R9
07 · Support

Questions, one topic at a time.

Estimate your shipping

Get the real shipping cost for this item to your address — the same rates as checkout.

Pick your countrySame rates as checkout

Choose a destination and hit Estimate — we fetch the live rates for this item.

How long does delivery take?

We’re based in Germany. Standard delivery goes by DHL and national postal services and takes about 2–5 days within Germany, 1–2 weeks within the EU and 2–6 weeks outside the EU. Need it sooner? Express delivery reaches most of the world within a few days — just choose it at checkout where available.

How much does shipping cost?

Your exact shipping cost is calculated by destination and weight and shown at checkout before you pay — no hidden fees. Express delivery is selectable at checkout where available.

Do you ship to my country?

Yes, we ship to over 130 countries. Prices, taxes and delivery times for your destination are calculated automatically at checkout.

Will I have to pay customs or import duties?

Within the EU, no — our prices already include all duties and EU VAT. For deliveries outside the EU (e.g. Switzerland, the UK or the USA), your order may be subject to import duties and taxes set by your country. These are collected by the carrier when your parcel arrives, aren’t included in our prices, and are outside our control.

How can I track my order?

As soon as your parcel ships we email you a tracking link, so you can follow it all the way to your door.

What if an item is out of stock?

On out-of-stock items you can request a delivery time or leave your email to be notified the moment it returns — just use the notification box on the product.

Didn’t find your answer?

Our team will personally help you choose the right gear or part — around 24h for a reply.