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Flex
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Thai-made 3" pie-cut intake pipe upgrade for 4JJ1 D-MAX and MU-X engines. Designed to improve airflow, reduce restriction, and clean up the engine bay — whether you're running a stock turbo or an upgraded setup.
Built for reliability, performance, and proper fitment
This 3-inch custom pie-cut intake pipe is fabricated in Thailand using proven diesel performance designs. The larger diameter improves intake flow and turbo response while maintaining strong coupler retention and engine-bay clearance.
Key benefits:
⚠️ DOES NOT SUIT: Models with the oil filter mounted high (unless modified/cut).
⚠️ IMPORTANT: Please confirm fitment before ordering. Contact us with your vehicle details if unsure.
Complete kit ready for installation. Professional-grade components for reliable performance.
Professional installation recommended for best results.
Installation tips:
⚠️ Note: Does NOT suit models with high-mounted oil filter unless pipe is modified or cut.
Ideal for:
Pairs well with:
For off-road / competition use only. Intake modifications may affect compliance. Check local regulations before purchase.
Q: Is this a direct replacement for the factory intake pipe?
A: Yes — designed to replace the factory intake pipe with a larger 3" diameter for improved airflow and reduced restriction.
Q: Will this work with my stock turbo?
A: Yes — works with both stock and upgraded turbos. Reduces intake restriction on any setup.
Q: Does this fit models with high-mounted oil filters?
A: No — this pipe does NOT suit models with high-mounted oil filters unless modified/cut. Check your engine bay configuration before ordering.
Q: Will this fit my vehicle with a body lift?
A: Not suitable for vehicles with body lifts due to clearance issues. Body lifts can cause interference with the hood - it may work with different couplings - untested.
Q: What's included in the kit?
A: Complete kit includes: 3" pie-cut intake pipe, 4× heavy-duty T-bolt clamps, and blue silicone couplers (3.25" → 3.0" and 3.0" → 2.75").
Q: Do I need to tune my vehicle after installing this?
A: Not mandatory for intake pipe alone, but ECU tuning can optimize performance when combined with other airflow upgrades.
Q: What's the quality like compared to eBay/AliExpress pipes?
A: This is proper Thai-made fabrication with quality materials and correct fitment — not thin, poorly-made eBay junk.
Q: Can I install this myself?
A: If you're mechanically capable, yes. However, professional installation is recommended to ensure proper fitment and no leaks.
Q: How do I confirm fitment for my vehicle?
A: Contact us with your vehicle year, model, and engine configuration. We can verify fitment before you order.
Flex 3" intake pipe. Thai-made pie-cut design. Reduced restriction. Improved turbo response. Heavy-duty T-bolt clamps. Complete kit ready to install.
Disclaimer: Common Rail Cowboys is not affiliated with Isuzu Motors or FLEX Thailand. Installation should be performed by a qualified technician. Proper installation and fitment verification are the buyer's responsibility.

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