Spark Exhaust Grid-O Full Exhaust System Stainless Steel / Titanium Kawasaki ZX-4RR (2023-2026) GKA8851T

The Spark Exhaust Grid-O full exhaust system for the Kawasaki ZX-4RR represents the pinnacle of Italian craftsmanship — a race-bred, mixed-material assembly that sheds 3.6 kg from the stock system while delivering the kind of aggressive, spine-tingling note already heard echoing through Moto2 and World Superbike paddocks worldwide.

Key Features

• Massive 3.6 kg weight reduction over the stock exhaust (from 9.4 kg down to 5.8 kg), directly improving chassis balance and agility
• Stainless steel header combined with a titanium slip-on silencer and titanium end cap — materials chosen for their exceptional temperature resistance and long-term durability
• Grid-O silencer proven in Moto2 and WorldSBK competition, offering outstanding flow characteristics and an aggressive, race-quality exhaust note
• Removable dB-Killer (part number G9980) included — install it when the circuit requires noise compliance, remove it for maximum performance
• Compatible with the original passenger footpeg; dedicated silencer-to-chassis mounting bracket included in the kit
• Handmade in Italy — every weld and joint produced to the exacting standards that define Spark Exhaust's reputation in professional motorsport

Build Quality and Materials

Where many aftermarket systems compromise either weight or longevity, the GKA8851T refuses to choose. The header is fabricated from premium stainless steel, providing the corrosion resistance and structural rigidity a four-cylinder inline engine demands under sustained high-rpm use. The silencer body and end cap are crafted from titanium — a material that simultaneously reduces rotating and unsprung mass and withstands the extreme thermal cycles a track day or championship race inflicts on every component. The result is a system that will not warp, discolour prematurely or fatigue under the conditions it was designed to meet.

Track Performance and Sound

The Grid-O canister is not a road silencer repurposed for the track — it is a genuine competition-developed piece used at the highest levels of circuit racing. Without the dB-Killer fitted, the system produces 107 dB at 5,500 rpm, delivering the full, uninhibited exhaust note that characterises a motorcycle tuned for outright lap time. When noise regulations apply, the included G9980 dB-Killer drops the output to a compliant level without requiring any permanent modification to the system.

To extract the maximum performance benefit from this exhaust, Spark Exhaust and Inter-Pace both recommend a bespoke race ECU map or a dyno remap calibrated specifically to the GKA8851T's flow characteristics. The improvement in throttle response and mid-to-top-end power delivery will be most apparent once the fuelling is optimised to match.

Fitment and Compatibility

The GKA8851T is designed and tested specifically for the Kawasaki ZX-4RR across model years 2023 to 2026. It is compatible with the original passenger footpeg in its standard position. A dedicated mounting bracket for attaching the silencer to the chassis is supplied as part of the kit; an optional additional chassis bracket is available separately for riders who require further mounting customisation.

Specifications

• Part Number: GKA8851T
• Type: Full exhaust system (header and silencer)
• Fitment: Kawasaki ZX-4RR, 2023–2026
• Header material: Stainless steel
• Silencer material: Titanium
• Silencer end cap material: Titanium
• Stock exhaust weight: 9.4 kg
• Installed weight: 5.8 kg
• Weight saving: 3.6 kg
• Sound level: 107 dB at 5,500 rpm (dB-Killer removed)
• dB-Killer: Removable, part number G9980 (included)
• Origin: Made in Italy