Flex
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Dump the spongy factory rubber. This full hard-pipe run replaces every OEM rubber section from the turbo compressor outlet to the intake manifold, delivering sharper throttle response and rock-solid boost control on tuned 4JJ1 / Duramax setups.
✅ Direct bolt-on: Model-specific design replaces factory rubber pipes with no modifications.
⚠️ IMPORTANT: Confirm fitment by checking your current piping matches the product photos. Message us with your VIN if unsure.
Complete kit ready for installation. Choose Black or Polished finish at checkout.
Professional installation recommended for best results.
Installation tips:
Ideal for:
For off-road / competition use only. Intake modifications may affect compliance. Check local regulations before purchase.
Q: Are these a direct bolt-on replacement?
A: Yes – model-specific design replaces factory rubber pipes from turbo to intake manifold with no modifications required.
Q: What finish should I choose?
A: Black for a stealthy OEM+ look, Polished for a show-quality engine bay. Both are equally durable and high-boost capable.
Q: Will these work with my aftermarket turbo?
A: Yes – designed to work with factory or aftermarket turbos. Perfect complement to Flex Mini F55, F55 Boost X, or other 4JJ1 turbo upgrades.
Q: Do I need a tune after installation?
A: No tune is required for hard pipes alone. However, if you're running a tuned vehicle with high boost, hard pipes are essential to prevent rubber ballooning.
Q: How much boost can these handle?
A: The alloy construction and heavy-duty T-bar clamps are designed for high-boost applications. Properly installed, they'll handle whatever your turbo and tune can produce.
Q: Will I need to modify anything during installation?
A: No modifications required for standard applications. Dry-fit first and ensure proper clearance. Some aftermarket setups may require minor adjustments.
Q: What's the difference between this and factory rubber?
A: Factory rubber pipes expand under boost (ballooning), reducing throttle response and potentially causing boost leaks. Hard pipes maintain consistent flow and eliminate these issues.
Q: How do I confirm fitment for my vehicle?
A: Check your current piping matches the product photos. Message us with your VIN if unsure and we'll confirm fitment before dispatch.
Q: Can I install these myself?
A: Yes, if you're mechanically capable. Dry-fit first, degrease all surfaces, and pressure-test after installation. Professional installation recommended for best results.
Q: Will these fit 2017+ D-MAX/MU-X?
A: No – this kit is specifically for 2012-2016 models (4JJ1, pre-DPF). Later models have different piping configurations.
FLEX alloy hard pipes. No ballooning. Rock-solid boost. Sharper response. Black or polished. Complete kit with couplers & clamps.
Questions? Message Common Rail Cowboys with your VIN and we'll confirm fitment before dispatch.
Disclaimer: Common Rail Cowboys is not affiliated with Isuzu Motors, Holden, or FLEX Thailand. Installation should be performed by a qualified technician. Proper installation, pressure testing and fitment verification are the buyer's responsibility.
