Spark Exhaust Trumpet Slip-On Pair Stainless Euro 4 Triumph Street Twin 900 (2017-2018) GTR0402IOM
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The long one, with papers. Spark's Trumpet slip-ons run further back along the Street Twin than the 60's shape and carry the same Euro 4 approval — a combination that is unusual enough in this catalogue to be the reason most people find the page.
Key Features
- Pair of Trumpet slip-on silencers for the Triumph Street Twin 900, 2017 to 2018.
- Euro 4 homologated, approval from the Italian Ministry of Transport.
- AISI 304 stainless with a Scotch-Brite finish.
- 3.5 kg against 7.5 kg standard.
- The longest of Spark's three shapes for this motorcycle.
- Header pipes and catalyst stay standard.
Length Changes the Motorcycle
A Street Twin is a short bike with a lot of visual weight in the tank and the engine, and the standard silencers are stubby enough to leave the tail looking cut off. A Trumpet reaches back past that, and the line it draws makes the whole machine read longer and lower.
Whether that is what you want is the entire decision. The 60's shape does the opposite — it emphasises how compact the bike is. Neither is more correct and both cost the same 856 euro.
The Same Name Across the Range
Spark uses Trumpet for this outline throughout its retro programme: a long, evenly tapering body that opens slightly at the mouth. The pair for the older Bonneville T100 carries the same name and the same silhouette.
The difference is what surrounds them. On a T100 the Trumpet is one classic shape among several on a chrome-heavy bike; on a Street Twin, which left the factory black and matte, it is the part that adds the brightness.
What the Approval Actually Covers
The exhaust as delivered, with the standard catalyst in place. Spark did not remove the converter to find the performance — the gain comes from the silencers and the pipe work behind the collector, and Spark places it at low and medium revs rather than at the top.
That distinction matters at an inspection. An approved silencer on a bike whose catalyst has been taken out is not an approved motorcycle.
Four Kilos
7.5 kg standard, 3.5 kg fitted. It is the same order of saving as the 60's pair, three hundred grams behind because the body is longer, and it comes off the back of a motorcycle that weighs a little over 200 kg wet.
Installation
Slip-on level: the standard silencers come off and Spark's go on, header pipes untouched. The approval covers the exhaust as delivered, so nothing about the fitting is a compromise on the paperwork.
Fitment & Compatibility
Triumph Street Twin 900, 2017 and 2018. Black ceramic version: GTR0402BOM. The shorter 60's pair is GTR0401IOM and GTR0401BOM; the Sinfonia is GTR0403IOM and GTR0403BOM. The Trumpet slip-ons also complete Spark's Euro 4 range for the Bonneville T120 alongside the GTR8804 full system.
Road Approval
Euro 4 homologated, released by the Italian Ministry of Transport, with the original catalyst retained.
Specifications
- Part number: GTR0402IOM
- Type: Slip-on, pair
- Design: Trumpet
- Material: AISI 304 stainless steel, Scotch-Brite finish
- Weight: 3.5 kg (standard 7.5 kg)
- Road approval: Euro 4 homologated
- Fitment: Triumph Street Twin 900 (2017-2018)
- Manufacturer: Spark Exhaust Technology, Mantova, Italy
| Part number | GTR0402IOM |
|---|---|
| Type | Slip-on |
| Silencer design | Trumpet |
| Material | Stainless steel |
| Spark weight | 3.5 kg |
| Standard weight | 7.5 kg |
| Weight saving | 4 kg |
| Fitment | Triumph STREET TWIN (2017-2018) |
| Road approval | EC type-approved — check certificate scope |
| Origin | Made in Italy |
- Triumph STREET TWIN
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// Spark Exhaust
Spark Exhaust Trumpet Slip-On Pair Stainless Euro 4 Triumph Street Twin 900 (2017-2018) GTR0402IOM

Tech specs
- Part number
- GTR0402IOM
- Type
- Slip-on
- Silencer design
- Trumpet
- Material
- Stainless steel
- Spark weight
- 3.5 kg
- Standard weight
- 7.5 kg
- Weight saving
- 4 kg
- Fitment
- Triumph STREET TWIN (2017-2018)
- Road approval
- EC type-approved — check certificate scope
- 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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