Spark Exhaust dB Killer Rectangular 150 mm Open Universal G9915
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A rectangular insert for a rectangular case. Spark's flat-sided silencers need a plug that matches their section, and this is the long one — a hundred and fifty millimetres.
Key Features
- dB killer for Spark rectangular silencers.
- 59.8 × 35.8 mm outer, 41.3 × 15.3 mm internal opening.
- 150 mm long.
- Open type — no perforated section.
- Stainless steel, removable.
- Spark part number G9915, made in Mantova, Italy.
Rectangular Means Rectangular
Nothing round fits a rectangular case, and a rectangular insert has two dimensions to get right instead of one. Fifty-nine point eight by thirty-five point eight is the seat; forty-one point three by fifteen point three is what the gas gets through.
That internal opening is a slot rather than a hole, and it is deliberately narrow in one axis. A tall thin opening presents more wall to the gas per unit of area than a round one would, which is where the attenuation comes from in an insert with no perforation.
The Long One
Spark builds two rectangular inserts. This is the 150 mm version with the smaller opening; G9920 is 70 mm long with a much larger one. They are not alternatives for the same job — the long, narrow one takes far more noise out.
Check the length available in your case before ordering. A hundred and fifty millimetres of insert needs a hundred and fifty millimetres of straight section behind the outlet.
Which Silencers
Spark's rectangular family, which it has fitted to Ducati and to several sports machines over the years. If you are matching an insert to a case you already own, the seat dimensions are the reliable check: measure the outlet opening across both axes.
An Older Family, Still Listed
The rectangular cases are not what Spark builds most of today, and the fact that both inserts remain in the 2026 price list is the useful part. An exhaust from an earlier generation stays serviceable.
Approval
Not affected by this article. Where the silencer is homologated the insert is part of the certified configuration and must stay in; where it is not, fitting the insert does not create a certificate.
| Part number | G9915 |
|---|---|
| Type | Open, no perforation |
| Material | Stainless steel |
| Dimensions | 35.8 × 59.8 mm, inner 41.3 × 15.3 mm, 150 mm long, straight cut |
| Fitment | Universal |
| Road approval | None — track use only |
| Fits | Spark rectangular silencers |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | RECTANGULAR - 35,8x59,8 int.41,3x15,3 00° l.150 |
Universal product — Please check whether it fits your bike.
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// Spark Exhaust
Spark Exhaust dB Killer Rectangular 150 mm Open Universal G9915

Tech specs
- Part number
- G9915
- Type
- Open, no perforation
- Material
- Stainless steel
- Dimensions
- 35.8 × 59.8 mm, inner 41.3 × 15.3 mm, 150 mm long, straight cut
- Fitment
- Universal
- Road approval
- None — track use only
- Fits
- Spark rectangular silencers
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- RECTANGULAR - 35,8x59,8 int.41,3x15,3 00° l.150
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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