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SpeedBox 1.4 B.Tuning for Bosch SX

Marsoni M251S
Sale price$396.75
Pay 4 payments of $99.19 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
SpeedBox 1.4 B.Tuning for Bosch SXSpeedBox 1. 4 B. Tuning for Bosch SX (Smart System + Rim Magnet) Advanced tuning chip for Bosch Performance Line SX motors (BDU3142, BDU3143) with simplified installationno magnet simulator required. Enables unlimited speed (max 35 km h recommended) and connects to the SpeedBox App for real time ride data. Activation via App, WALK function, or + + buttons. Compatible with Bosch Rim Magnet setups and current software versions. Note: Not compatible with
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.4 ★★★★★
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Dalia Toppin
Port Orchard, US
★★★★★ 5
Make sure you know the size
Yes worked like a charm
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
M
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Michael Jozefczak
Lake Worth, US
★★★★★ 5
Great fitment, made changing the oil filter easy
Perfect fit for my m760i oil filter housing.
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Reviewed in the United States on April 24, 2026
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Benjamin Tua
Lexington, US
★★★★★ 5
s tier quality
superior quality, single cast aluminum 👍
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Reviewed in the United States on May 2, 2026
M
Verified Purchase
Mr. Jibby
Bozeman, US
★★★★★ 4
Too Tight but It Works
It doesn't really sit on very well to be honest, it tends to sit TOO tight in my opinion. Taking it off can be a hassle but at least it gets the job done, durability is good, finish is great, obviously easy to use.
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Reviewed in the United States on April 28, 2025
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Hernan
Pawtucket, US
★★★★★ 5
BMW F25
Saved me when tried to change the oil. Great price
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Reviewed in the United States on May 23, 2026

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