Spark Exhaust Konix Evo Racing Slip-On Titanium Kawasaki Z900 (2025-2026) GKA0907T

The same Konix Evo, without the certificate. Spark builds this slip-on in a racing version alongside the homologated one, and the difference is entirely in the paperwork rather than in the box.

Key Features

• Racing slip-on for the Kawasaki Z900, 2025 to 2026.
• Konix Evo silencer in titanium with a carbon fibre end cap.
• Titanium interior and titanium fitting.
• Around forty euros below the homologated version.
• Carbon fibre heat shield on the pipe.
• No homologation — closed circuits and private land only.

Forty Euros and a Certificate

Spark charges around forty euros less for this than for the Euro5+ homologated GKA0907TOM. That gap does not buy a lighter or freer silencer — the two are the same case, the same materials and the same construction.

What it buys is the absence of a homologation. For a motorcycle that is only ridden on closed circuits, that is a reasonable saving. For a registered Z900 it is not a saving at all, because the exhaust cannot legally be used — and forty euros is a very small amount to give up a road approval for.

When the Racing Version Is the Right One

There are two situations where it genuinely is. The first is a dedicated track bike that will not be registered again, where the certificate has no value. The second is a market outside the EU where the Euro5+ approval means nothing anyway.

Everywhere else, look at the homologated number. Spark sells both because both markets exist, not because one is a better silencer.

What Is in the Box

The Konix Evo here is built exactly as the approved one: titanium case, titanium interior, titanium fitting and a carbon fibre end cap. Spark calls the construction ultralight, and the figures for this range bear it out at 1.7 kg against a 4.3 kg standard silencer.

The carbon fibre heat shield for the connecting pipe is supplied, as it is with the homologated versions. Installation is quick and needs no other changes to the motorcycle.

Why the Konix Evo Suits This Bike

Spark says the case was drawn with angular lines that blend with the Z900, and in front of the motorcycle that holds up. Kawasaki's naked is built from hard creases and flat surfaces; a soft cylindrical silencer sits awkwardly beside it.

The Konix Evo picks that language up, and the carbon end cap — cut at an angle rather than square — finishes it. Whether the silencer carries a certificate or not, the shape is the same argument.

The Weight Is the Same Too

Spark quotes 1.7 kg for its Euro5+ Z900 slip-ons against a 4.3 kg standard silencer, and the racing listing is the same component. Two and a half kilos come off the tail either way.

On a naked bike that mass sits low, to one side and well behind the centre — the least useful place it could be. It is the single cheapest handling change available on a Z900, and it does not depend on which listing you buy.

Fitment & Compatibility

Kawasaki Z900, 2025 through 2026. The Euro5+ homologated versions are GKA0907TOM in titanium and GKA0907DOM in electro-coloured dark. The Grid-O slip-ons are GKA0908TOM and GKA0908T. Spark's limited edition titanium racing collector is GKA8503.

Road Approval

None. This is the racing version and carries no homologation. Closed circuits and private land only.

Specifications

• Part number: GKA0907T
• Type: Slip-on, racing
• Silencer: Konix Evo, titanium case, interior and fitting
• End cap: carbon fibre
• Included: carbon fibre heat shield
• Homologation: none
• Fitment: Kawasaki Z900 (2025-2026)
• Road approval: None — racing use only
• Manufacturer: Spark Exhaust Technology, Mantova, Italy