125 and HP

Name: Exhaust -DEXTER RACING- Modern Box Ø28mm- Vespa Smallframe PK 50/80/125 and HP
Brand: DEXTER RACING
SKU: DEXMB28PK
Price: 269.00 EUR
Availability: InStock

Early torque, wide band - fourth gear with full thrust

Optics close to standard, reduced noise level (quieter than Proma)

Installation without frame work, tires 3.00-10 and 90/90-10 compatible

269,00 €*

available immediately

Shipping weight 2,55 kg

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Dexter Racing × W1R "Classic/Modern Box 3.0" - Smallframe exhaust Ø28 / Ø32 (50-144 cc)

Box system from the collaboration with W1R. Character: early, rich torque like a classic "banana exhaust", with higher revs and better peak power. Two variants with a targeted application range: Ø28 mm for short-stroke 75-112/115-130 cc setups, Ø32 mm for 133 cc and larger.

Ø28 / Ø32 manifold 43 / 51 mm stroke PK / HP Plug-and-Play 3.00-10 / 90/90-10

Characteristics

Box with early pressure build-up, stable revving

More peak power and speed reserve compared to classic bananas

Pleasant noise, near-standard external appearance

Technical data and variants

Manifold: Ø28 mm or Ø32 mm

Stroke: 43 mm and 51 mm

Mounting: one-piece, directly on the cylinder; PK/HP without modification

Partition wall: remains mounted

Tires: 3.00-10 or 90/90-10

Which version when? Ø28 mm vs. Ø32 mm

Ø28 mm - short-stroke and powerful for everyday use

Classic short-stroke setups 75-102 cc and medium-volume 115-130 cc

Rotary valve or diaphragm carburetor with moderate cross-sections

Focus on early torque, clean pulling power and good shift connection behavior

Recommended for conventionally stepped road transmissions (without short 4-speed)

Ø32 mm - large volume and high revving

≥133 cc, performance-oriented setups with higher throughput

Cylinder with larger exhaust cross-section, higher timing, large carburetor

More peak power and rev reserve, still good 4th gear connection

Also suitable for everyday use if the peripherals are matched to the larger cross-section

Note: On conventional setups, revs above 9 000 /min are realistic. The final choice depends on cylinder porting, carburetor size and desired characteristics.