The facts.
| Part number | G9987 |
|---|---|
| Type | Open, no perforation |
| Material | Stainless steel |
| Dimensions | Ø 32 mm, 100 mm long |
| Fitment | Universal |
| Road approval | None — track use only |
| Fits | Spark Grid-O silencers |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Grid-O - d.32 l.100 |
DescriptionThe whole story▼
Thirty-two millimetres — the narrowest Grid-O insert Spark builds, and the one to reach for when a circuit's limit is genuinely tight.
Key Features
- dB killer for Spark Grid-O silencers.
- Ø 51.5 mm outer, 32 mm internal bore, 100 mm long.
- Open type, no perforation.
- The most restrictive of the four Grid-O inserts.
- Stainless steel, removable.
- Spark part number G9987, made in Mantova, Italy.
The Bottom of the Ladder
Spark's four Grid-O inserts run 32, 38, 40 and 45 millimetres. This is the smallest, and the step down from 38 is worth about a quarter of the flow area — a real intervention rather than a trim.
Take it when the machine is well over a limit and the alternative is not riding. On a small engine it costs less than you would expect; on a large one it will be felt.
A Hundred Millimetres
Shorter than the 38 mm insert's hundred and fifty, which makes it easier to accommodate in a case with limited clear length behind the outlet. Between bore and length, bore is doing most of the work here.
The Grid-O Case
Six hundred grams of titanium with a woven mesh across the outlet, developed on the Triumph Moto2 engine. It is Spark's most extreme silencer and, unsurprisingly, the family whose owners most often need an insert.
Every Grid-O takes a 51.5 mm insert body. Only the bore differs, and that is what you order by.
Measuring Before You Order
If the silencer came to you without its insert, the outlet bore is the figure to establish. Four articles share one outer diameter and only the internal opening separates them; a photograph will not tell you which one you need.
Send us the exhaust's article number instead and we will look it up.
Fifty-One and a Half Millimetres of Body
Common to all four Grid-O inserts, which is why they cannot be told apart on a shelf. If you own more than one, mark the bore on the flange with a punch — it takes a minute and saves a wrong fitting on a trackday morning.
Legal Position
An insert manages noise; it does not create approval. On a homologated Spark exhaust the plug that came with it is the one the certificate describes, and substituting a different bore puts the machine outside the tested configuration.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
Questions, one topic at a time.
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
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.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
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.
Our team will personally help you choose the right gear or part — around 24h for a reply.