Spark Exhaust dB Killer Grid-O 40 mm Open Spare for GTR0501T and GTR0507TOM G9980

The Grid-O insert at forty millimetres of bore — and the article Spark names as the spare part for two of its Triumph exhausts.

Key Features

• dB killer for Spark Grid-O silencers.
• Ø 51.5 mm outer, 40 mm internal bore.
• Open type — no perforated wall.
• Listed in Spark's price list as the spare part for GTR0501T and GTR0507TOM.
• Stainless steel, removable.
• Spark part number G9980, made in Mantova, Italy.

Two Descriptions, One Part

Spark's price list calls this the db killer for GTR0501T and GTR0507TOM. Its website calls it the 40 mm open insert for Grid-O silencers. Both are true: those two Triumph exhausts carry a Grid-O case, and this is the plug that belongs in it.

Which means the article is useful beyond those two numbers. Any Spark Grid-O whose outlet takes a 40 mm insert takes this one.

Four Bores in the Grid-O Family

Spark builds the Grid-O insert at 32, 38, 40 and 45 millimetres, all in the same 51.5 mm body. This is the second widest.

The bore, not the body, is what you match. If you have a Grid-O and no insert, measure what the silencer's outlet accepts before ordering — four articles look identical from the outside.

Open Rather Than Perforated

All four Grid-O inserts are open. The case has a woven titanium mesh across the whole outlet and does a good deal of its own work; adding a perforated plug behind a mesh would restrict without adding much attenuation.

A Genuine Spare

On the two Triumph exhausts Spark names, this insert is part of what the customer bought. Losing it does not mean buying a new silencer — it means fifty-two euro and a screwdriver.

Fifty-Two Euro Against a Silencer

That is the arithmetic behind every article on this page. A Grid-O case is a six-hundred-gram titanium object that costs several hundred euro; the plug that makes it usable at a noise-limited circuit costs less than a tank of fuel.

Approval

Where the exhaust it belongs to is homologated, this insert is part of the configuration that was tested and it must be fitted. Where the exhaust is a racing article, no insert changes its status.