{"product_id":"spark-exhaust-db-killer-round-oval-30mm-18-holes","title":"Spark Exhaust dB Killer Round and Oval Old Style 30 mm 18 Holes G9902","description":"\u003cp\u003eEighteen holes and a thirty millimetre bore — the narrowest insert in Spark's round-case range, for the round and oval silencers of the old style.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003edB killer for Spark round and oval silencers, old style.\u003c\/li\u003e\n\u003cli\u003eØ 47.3 mm outer, 30 mm internal bore.\u003c\/li\u003e\n\u003cli\u003ePerforated: 18 holes.\u003c\/li\u003e\n\u003cli\u003eStainless steel, removable with hand tools.\u003c\/li\u003e\n\u003cli\u003eConfers no approval on the silencer it is fitted to.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9902, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe Narrowest Bore Spark Lists\u003c\/h2\u003e\u003cp\u003eThirty millimetres, against thirty-two for most of the round-case inserts and thirty-five or forty for the modern families. Two millimetres does not sound like much until you work out the area: a 30 mm bore passes roughly twelve per cent less than a 32.\u003c\/p\u003e\u003cp\u003eThat is the article's purpose. It is for the case where the usual insert is not enough — an older, larger-bore silencer, or a venue with a limit set low.\u003c\/p\u003e\u003ch2\u003eEighteen Holes\u003c\/h2\u003e\u003cp\u003eFewer than the twenty-eight of the newer round insert, and a different acoustic result. A smaller number of holes over the same length means each one carries more gas, which shifts the frequency the insert attenuates most.\u003c\/p\u003e\u003cp\u003eSpark did not choose the number for looks. It was matched to the internal volume of the cases it goes into.\u003c\/p\u003e\u003ch2\u003eRound and Oval, Old Style\u003c\/h2\u003e\u003cp\u003eTwo case profiles, one insert. Spark's earlier generation used a common outlet section across both the round and the oval silencer, so a single article number covers them. The current families do not share that section, which is why there are now several inserts instead of one.\u003c\/p\u003e\u003ch2\u003eKeeping an Old Exhaust Usable\u003c\/h2\u003e\u003cp\u003eThe reason a part like this stays in a 2026 price list is that Spark exhausts outlive the motorcycles they were bought for. A silencer from an earlier decade that has lost its insert is not scrap; it is a silencer waiting for a forty-one euro part.\u003c\/p\u003e\u003cp\u003eIf you are matching one to a case you already own, measure the outlet bore and count the seat angle before ordering. We will check the number against Spark's list.\u003c\/p\u003e\u003ch2\u003eTrack Use\u003c\/h2\u003e\u003cp\u003eThis insert exists for noise limits, not for paperwork. Spark's old-style round and oval cases were sold without homologation and remain without it; fitting the plug lowers the reading and changes nothing else.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53617778688266,"sku":"G9902","price":41.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/5b865bf3eeb1f_fe34d1f1-5548-4d34-a4b2-407947f5bdb2.png?v=1788343197","url":"https:\/\/inter-pace.com\/en-at\/products\/spark-exhaust-db-killer-round-oval-30mm-18-holes","provider":"Inter-Pace","version":"1.0","type":"link"}