Spark Exhaust Titanium 4-2-1 Racing Collector Kawasaki ZX-4RR (2023-2026) GKA8851
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The titanium manifold on its own, sized to take any of Spark's silencer groups for the ZX-4RR. The arithmetic is worth stating: this collector is 1,536 euro, the Konix Evo silencer group 666, and the assembled titanium system 2,214. Buying the halves costs what buying the whole costs.
Key Features
- Titanium 4-2-1 racing collector for the Kawasaki ZX-4RR.
- Connections machined from solid by CNC.
- Sized compensators rather than standard parts.
- Takes any Spark silencer group for this motorcycle.
- Supplied without silencer.
- Racing part, no homologation.
Four Into Two Into One
On a screaming 400 four-cylinder the collector is where the exhaust is actually designed. Four primaries pair into two, the two merge into one, and the diameters and taper of each stage decide where in the rev range the pressure waves help rather than fight.
Spark sized this one for the ZX-4RR specifically rather than scaling a 600 layout down, which on an engine that lives above 12,000 rpm is not a detail you can borrow.
Machined Joints and Sized Compensators
Two details Spark carries over from its Superbike and Moto2 work. The connections are cut from solid on a CNC instead of being folded and welded, so a joint that gets split between sessions seals the same way each time. The compensators — the flexible sections that absorb thermal movement — are sized for this system rather than taken off a shelf.
Neither is visible once the fairing is on. Both are the reason a race exhaust survives a season of heat cycles without the couplings going slack.
What You Still Need
A silencer group. Spark builds three for this motorcycle at the same interface: the Konix Evo GKA8850ST, the 350 mm Force Evo GKA8852ST and the 400 mm Force Evo GKA8855ST that belongs to the 98 dB configuration.
Assembled systems, if you would rather order once: GKA8856T with the Konix Evo on this titanium collector, and GKA8850T, GKA8852T, GKA8855T and GKA8851T on the stainless one.
Fitment & Compatibility
Kawasaki ZX-4RR, 2023 to 2026. The stainless version of the same layout is fitted to Spark's other systems for this bike.
Road Approval
None. Racing part, closed course only.
Specifications
- Part number: GKA8851
- Type: Header, 4-2-1 collector
- Material: titanium
- Connections: CNC machined from solid
- Supplied: collector only
- Road approval: none, track use
- Fitment: Kawasaki ZX-4RR (2023-2026)
- Manufacturer: Spark Exhaust Technology, Mantova, Italy
| Part number | GKA8851 |
|---|---|
| Type | Header |
| Material | Titanium |
| Spark weight | 3.6 kg |
| Standard weight | 9.4 kg |
| Weight saving | 5.8 kg |
| Fitment | Kawasaki ZX-4 RR / ZX-4R 400 (2023-2026) |
| Road approval | None — track use only |
| Origin | Made in Italy |
- Kawasaki ZX-4 RR
- Kawasaki ZX-4R 400
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// Spark Exhaust
Spark Exhaust Titanium 4-2-1 Racing Collector Kawasaki ZX-4RR (2023-2026) GKA8851

Tech specs
- Part number
- GKA8851
- Type
- Header
- Material
- Titanium
- Spark weight
- 3.6 kg
- Standard weight
- 9.4 kg
- Weight saving
- 5.8 kg
- Fitment
- Kawasaki ZX-4 RR / ZX-4R 400 (2023-2026)
- Road approval
- None — track use only
- Origin
- Made in Italy
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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