Spark Exhaust Stainless Steel Tube Ø 54 × 1.0 mm 500 mm Universal G9003
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Fifty-four millimetres — the diameter Spark builds its own three-quarter kits around on the Yamaha R1. If you are matching to one of those systems, this is the tube.
Key Features
- Straight exhaust tube, AISI 304 stainless steel.
- Ø 54 mm outside, 1.0 mm wall thickness.
- 500 mm long.
- The diameter used in Spark's own d.54 stainless manifold kits.
- Spark part number G9003, made in Mantova, Italy.
Spark's Own d.54 Kits
Spark lists several articles specifically at this diameter: the stainless manifold of its three-quarter kits and the silencer groups that bolt to them. That is the clearest possible statement of what fifty-four is for — the collector section of a litre-class four.
If a project involves adapting one of those kits, ordering the same diameter as stock removes an adapter from the design.
Filler Rod
Use 308L for AISI 304. It is the standard match, it has the low carbon content that keeps chromium carbide from forming at the grain boundaries, and it is what makes the difference between a weld that lasts and one that goes rusty along the heat-affected zone.
Mild steel filler in a stainless joint will fail. It is worth saying because it happens.
Drumming
A large-diameter thin-wall tube is a drum. On a long unsupported run at this size, engine harmonics can set the tube ringing at particular revs — audible in the cabin of a car and audible to the rider on a motorcycle.
The cure is a mount in the middle of the run, or a short section of the next size sleeved over the worst of it.
Lambda Bosses
If the system needs an oxygen sensor, weld the boss before final assembly and put it at least three tube diameters downstream of a junction. Spark sells the bung separately as article SGATT139.
Marking Before Cutting
Use a fine permanent marker and a strip of paper wrapped round the tube for a square line. A scribed line on stainless is a stress raiser and a scratch you will still see after the system is finished; on a visible section of a custom exhaust that matters.
Ordering
500 mm per article, uncut.
| Part number | G9003 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | Ø 54 × 1.0 mm, 500 mm long |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Tube l.500mm - d.54 x 1,0mm |
Universal product — Please check whether it fits your bike.
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// Spark Exhaust
Spark Exhaust Stainless Steel Tube Ø 54 × 1.0 mm 500 mm Universal G9003

Tech specs
- Part number
- G9003
- Type
- Bent pipe
- Material
- AISI 304 stainless steel
- Spark weight
- 0.2 kg
- Dimensions
- Ø 54 × 1.0 mm, 500 mm long
- Fitment
- Universal
- Road approval
- None — track use only
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Tube l.500mm - d.54 x 1,0mm
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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