Spark Exhaust Bent Tube 30° Ø 45 × 1.0 mm Stainless Steel Universal G9104
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Forty-five millimetres at thirty degrees. Large enough to carry a big twin on its own, gentle enough to cost the gas almost nothing.
Key Features
- Mandrel-formed 30° bend, AISI 304 stainless steel.
- Ø 45 mm outside, 1.0 mm wall thickness.
- One of two diameters Spark also bends through 180°.
- Matches Spark's 45 mm straight tube, article G9002.
- Spark part number G9104, made in Mantova, Italy.
Sizing the Run
Forty-five suits a large parallel twin, a V-twin between eight hundred and a thousand, or the front section of a four before the collector. On anything smaller the gas slows and the bottom end goes with it.
The Full Set at This Diameter
Forty-five is one of only two sizes Spark bends through a complete 180 degrees, alongside fifty. That makes it the diameter with the widest choice of angles: thirty, forty-five, ninety and a full U.
If a design has an underseat loop in it, this is one of the two diameters that can be built without welding two ninety degree bends together.
Purging a Curved Joint
Back-purging a straight tube is easy: plug both ends, fill with argon, weld. A run with bends in it holds gas differently and needs longer to displace the air, particularly if the bend traps a pocket at the top.
Give it more time than seems necessary. A sugared root inside a bend is invisible until the joint cracks.
Weld Preparation
A butt joint in one millimetre stainless does not want a chamfer — there is not enough wall for one. What it wants is a square cut, a tight gap and clean metal on both sides, wiped with acetone rather than brake cleaner.
Mandrel, Not Crush
A mandrel bender supports the tube from inside as it forms, so the section stays round and the bore stays constant through the curve. A crush bender flattens the tube on the radius, exactly where the gas is already having to turn. Every bend Spark sells is mandrel-formed, and at forty-five millimetres in one millimetre wall that is not something a workshop press will match.
Ordering
One bend per article. Spark makes 30°, 45°, 90° and 180° in this diameter.
| Part number | G9104 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 30°, Ø 45 × 1.0 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 30° - d.45 x 1,0mm |
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// Spark Exhaust
Spark Exhaust Bent Tube 30° Ø 45 × 1.0 mm Stainless Steel Universal G9104

Tech specs
- Part number
- G9104
- Type
- Bent pipe
- Material
- AISI 304 stainless steel
- Spark weight
- 0.2 kg
- Dimensions
- 30°, Ø 45 × 1.0 mm
- Fitment
- Universal
- Road approval
- None — track use only
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Bended tube 30° - d.45 x 1,0mm
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
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