The facts.
| Part number | G99100 |
|---|---|
| Type | dB killer |
| Material | Stainless steel |
| Dimensions | Ø 61 → Ø 45 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Fits | Spark Dyno silencers |
| Note | Bore: 38 mm per Spark's page, 45 mm per the price list — confirm before ordering |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
DescriptionThe whole story▼
The insert for Spark's Dyno case: sixty-one millimetres of body, a hundred and fifteen of length. It is also the one article in this range where Spark's two sources do not agree, and we have set out why below.
Key Features
- dB killer for Spark Dyno silencers.
- Ø 61 mm outer, 115 mm long.
- Stainless steel, removable.
- Internal bore: Spark's article page says 38 mm, the 2026 price list says 45 mm. Read the note.
- Spark part number G99100, made in Mantova, Italy.
The Figure We Will Not Guess
Spark's website gives the internal diameter as 38 mm. Spark's 2026 dealer price list describes the same article as Ø61–Ø45. Outer diameter and length match across both; the bore does not.
Seven millimetres is not a rounding error — it is nearly forty per cent of flow area, and it is the difference between an insert that trims and one that transforms. So we are printing both figures rather than choosing one. If the bore decides your purchase, tell us and we will have Spark confirm it before the order goes out.
The Dyno Silencer
Dyno is Spark's racing case, the one that appears on its three-quarter kits and full systems for Panigale and similar machines. It is a large-diameter silencer, which is why the insert body is 61 mm — the widest in this catalogue.
Nothing from another family will fit it, and this insert will not fit anything else.
Two Dyno Inserts
Spark lists this one and G9998, the black Ø61–Ø28. The second is far more restrictive and is the part for a strict limit; this one is the everyday plug.
A Hundred and Fifteen Millimetres
Long enough to work on the gas column over a distance rather than at a point, which is how an insert of this diameter manages a useful reduction at all. Check that the case has the clear length before ordering.
Sixty-One Millimetres
The widest insert body Spark builds, and a figure unique to the Dyno case. There is no risk of confusing this article with anything else in the range — it will not go into any other silencer.
Approval
The Dyno cases are racing articles. This insert lowers the reading at a noise check; it does not create a certificate and does not make a racing system road legal.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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