Spark Exhaust Grid-O Racing Full System High Mount Honda CB650R / CBR650R (2019-2025) GHO8840T

Six kilos out of a motorcycle that carries 10,7 in its standard exhaust alone. Spark's high-mount racing kit puts a Grid-O titanium silencer behind stainless manifolds and a stainless fitting, with nothing between them that has to pass an emissions test.

Key Features

• Racing full system for the Honda CB650R and CBR650R.
• AISI 304 stainless manifolds and stainless fitting.
• Grid-O silencer in titanium, high mounting.
• 4,8 kg against 10,7 kg for the standard system.
• No catalyst.
• Racing part, not approved for road use.

Where the Six Kilos Are

The standard exhaust on a 650R is four steel primaries, a collector, a catalytic section in its housing, and a steel silencer. Spark replaces the whole run with stainless manifolds and a titanium can, and the catalyst does not come back.

4,8 kg against 10,7 is a 5,9 kg saving — more than half the assembly. On a motorcycle in this class that is a meaningful fraction of what a rider can realistically remove.

Which Article Is Which

Four systems, one platform, and the names do not make the differences obvious. GHO8838TOM is the approved one, low-mounted, with a catalyst box. GHO8839T is the racing Konix Evo. This is the racing Grid-O. GHO8841T is the same idea with a titanium link pipe instead of a stainless one.

The weights run 6,5 · 5,7 · 4,8 · 3,7 kg in that order, against 10,7 standard. Price does not follow weight: the lightest is not the dearest, and the approved one is.

The Manifolds Are Shared

All four systems use the same AISI 304 stainless manifolds, with the collector diameters and 4-2-1 conic sections Spark developed for this engine. What changes across the range is everything behind them.

Stainless Fitting, Not a Catalyst Box

The difference between this article and the approved GHO8838TOM is what sits between the manifolds and the silencer. There, a box containing Spark's own catalyst. Here, a plain stainless fitting.

That is 1,7 kg of the difference between the two kits, and all of the difference in their legal status.

The Grid-O

The Grid-O is the round Spark silencer with the mesh outlet cap, in full titanium with visible TIG welds. It is the same design that was on the 2020 Moto2 world championship-winning machine.

Its large diameter is deliberate on a four-cylinder — Spark uses it where the aim is to give the four-cylinder sound room rather than to shorten it.

High Mounting

The silencer sits high on the flank rather than low under the engine. On a naked CB650R that puts it in the eyeline; on a faired CBR650R it changes the profile of the tail.

It also clears the ground better, which matters on a bike that spends its weekends being leaned over.

Fitment & Compatibility

Honda CB650R Neo Sports Café and CBR650R, 2019 to 2025. The Euro5 approved kit is GHO8838TOM. The Konix Evo racing version is GHO8839T; the lightest racing system, with a titanium TIG-welded pipe, is GHO8841T at 3,7 kg.

Road Approval

None. Spark lists this system as not approved. Closed course use only.

Specifications

• Part number: GHO8840T
• Type: Full system, racing, high mount
• Design: Grid-O
• Manifolds: AISI 304 stainless steel
• Fitting: stainless steel, no catalyst
• Silencer: titanium
• Weight: 4,8 kg (standard system 10,7 kg)
• Road approval: none, racing part
• Fitment: Honda CB650R / CBR650R (2019-2025)
• Manufacturer: Spark Exhaust Technology, Mantova, Italy