Spark Exhaust Sinfonia Slip-On Pair Stainless Euro 4 Triumph Street Twin 900 (2017-2018) GTR0403IOM
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The middle choice. A Sinfonia body is straighter-sided than the Trumpet and longer than the 60's, and on a Street Twin it is the pair that changes the least about how the motorcycle looks while still changing what it weighs and what it sounds like.
Key Features
- Pair of Sinfonia slip-on silencers for the Triumph Street Twin 900, 2017 to 2018.
- Euro 4 homologated.
- AISI 304 stainless, Scotch-Brite finish.
- 3.5 kg against 7.5 kg standard.
- Straight-sided body, square outlet.
- Original catalyst retained.
Straight Rather Than Tapered
The three shapes Spark offers here differ mostly in what the body does along its length. The 60's rises and cuts off at an angle. The Trumpet tapers and opens. The Sinfonia runs close to parallel and finishes square.
Parallel is the quietest of the three visually. It reads as a well-made standard silencer rather than as an accessory, which on a bike people buy for its restraint is a real argument.
Buying a Pair
A Street Twin carries a silencer on each side and Spark supplies both in one article. That is not a detail worth glossing over, because the price comparison people make in their head is usually against a single aftermarket can.
856 euro buys the pair, the mounting hardware and a type approval. Reckoned that way it is not an expensive exhaust.
The Catalyst Stays Where It Is
Spark's approval covers this system with the original catalytic converter in place. There is no decat pipe hidden in the box and no instruction to remove anything, which is why the paperwork holds.
It also means the performance claim is modest and honest: an improvement at low and medium revs, not a headline figure. A 900 cc parallel twin with the standard cat is not going to gain ten horsepower from a silencer, and Spark does not pretend otherwise.
Four Kilos Off the Tail
7.5 kg standard against 3.5 fitted. The saving sits high and behind the rear axle line, which is the least helpful place to carry weight on any motorcycle and the most noticeable place to lose it.
Scotch-Brite, and Why It Suits This Bike
The stainless is brushed rather than polished. A Street Twin is a deliberately matte motorcycle — black engine cases, satin paint, brushed alloy — and a mirror-polished silencer would be the only thing on it shining.
Brushed stainless sits at the same level of brightness as the fork lowers and the bar clamps, which is why Spark finishes the road range this way rather than chroming it.
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. The black ceramic version is GTR0403BOM. The other shapes: 60's, GTR0401IOM and GTR0401BOM; Trumpet, GTR0402IOM and GTR0402BOM.
Road Approval
Euro 4 homologated, approval released by the Italian Ministry of Transport, original catalyst retained.
Specifications
- Part number: GTR0403IOM
- Type: Slip-on, pair
- Design: Sinfonia
- 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 | GTR0403IOM |
|---|---|
| Type | Slip-on |
| Silencer design | Sinfonia |
| 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 Sinfonia Slip-On Pair Stainless Euro 4 Triumph Street Twin 900 (2017-2018) GTR0403IOM

Tech specs
- Part number
- GTR0403IOM
- Type
- Slip-on
- Silencer design
- Sinfonia
- 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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