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Flex
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Signature Mini F55 Sound | Fast Spool | Built for Power
Elevate your 1KD N70 diesel build with the FLEX PRO R31-R V2 Turbo Low-Mount Kit, known as the Mini F55. This 44mm gated turbo delivers rapid lowβmid RPM spool, sharp response, and the iconic F55 whistle / "Stu Stu Stu" soundβideal for daily, touring, and performance builds.
β οΈ FABRICATION REQUIRED: Dump pipe must be custom fabricated to suit OEM, aftermarket or 3" exhausts. Custom intake required, among other modifications.
Complete low-mount turbo kit:
More or less everything you need for an easy installation (intake and dump pipe fabrication required).
Get the most from your Mini F55 Low-Mount:
For off-road / competition use only. Turbo modifications may affect compliance. Check local regulations before purchase.
Q: Do I need custom fabrication?
A: Yes β you'll need a custom dump pipe and intake to suit your vehicle/exhaust (OEM or 3").
Q: Is tuning required?
A: A professional ECU remap is highly recommended to safely control boost, fueling, and timing.
Q: What boost can it safely run?
A: Rated to around 35 PSI with correct fueling and tuning. Your tuner will set safe targets based on your setup.
Q: Will it bolt to my factory manifold?
A: Yes β re-oriented specifically for 1KD low-mount applications. Bolts to factory manifold location.
Q: Is this road-legal?
A: Sold for off-road/competition use where permitted. Check local regulations before purchase.
Q: What makes the "Stu Stu Stu" sound?
A: The iconic sound comes from the gated wastegate actuator combined with the turbo's compressor design. It's the signature Mini F55 whistle and chatter.
Q: Is this suitable for daily driving?
A: Yes β when properly tuned, the Mini F55 offers a great balance of performance and drivability for street and touring use.
Q: What's the difference between this and the 4JJ1 Mini F55?
A: This version is specifically re-oriented for 1KD N70 Hilux low-mount applications. The 4JJ1 version has different orientation and fitment.
Q: What's included in the kit?
A: Complete kit includes turbo, actuator bracket, 35 PSI wastegate actuator, dump pipe flange, gaskets, oil feed/return lines, Liqui Moly pre-lube, and all mounting hardware.
FLEX Mini F55 low-mount kit. Stu Stu Stu chatter. Fast spool. 35 PSI capable. Complete kit with pre-lube. 1KD N70 Hilux specific.
Disclaimer: Common Rail Cowboys is not affiliated with Toyota Motor Corporation or FLEX Thailand. Installation should be performed by a qualified technician. Custom fabrication, proper tuning and supporting modifications are the buyer's responsibility.

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