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TRD Pro & Trail Hunter Intake Systems on Non-Pro/TH Tacomas: What You Need to Know
At Overland Tailor Tuning (OTT), we’re committed to delivering cutting-edge calibration solutions and accurate information for Toyota owners. Through our ongoing R&D—along with valuable community feedback—we’ve uncovered an important detail in the 4th Gen Tacoma (which is also applicable to 6G 4Runners) where owners interested in swapping TRD Pro or Trail Hunter (TH) intake systems onto non-Pro/TH models, including hybrids:
**These intake systems are NOT plug-and-play on standard Tacoma models without proper calibration.**
Why the Pro/Trail Hunter Intake Doesn’t Just Work on non-Pro/Trail Hunters
What We’re Seeing in Testing
The Solution: Proper MAF Calibration
Custom MAF calibration is required to make these intakes function correctly on non-Pro/TH Tacomas. By updating the ECU’s airflow tables, we ensure:
At the time of release of our 6th Gen 4Runner calibration, OTT began offering calibration services specifically for Pro/TH intake swaps. This means owners of standard and hybrid 4Runners will be able to run TRD Pro or TH intakes with confidence and without drivability issues.
At Overland Tailor Tuning (OTT), we’re committed to delivering cutting-edge calibration solutions and accurate information for Toyota owners. Through our ongoing R&D—along with valuable community feedback—we’ve uncovered an important detail in the 4th Gen Tacoma (which is also applicable to 6G 4Runners) where owners interested in swapping TRD Pro or Trail Hunter (TH) intake systems onto non-Pro/TH models, including hybrids:
**These intake systems are NOT plug-and-play on standard Tacoma models without proper calibration.**
Why the Pro/Trail Hunter Intake Doesn’t Just Work on non-Pro/Trail Hunters
- Different Airbox & MAF Housing: The TRD Pro and TH airboxes use a larger MAF housing and different internal geometry compared to standard Tacoma intakes.
- ECU Calibration Mismatch: Because of the larger metering section, the same MAF sensor signal now corresponds to a different airflow mass than the ECU expects.
- CEL & Fueling Errors: Without recalibration, the ECU misinterprets airflow, leading to fueling errors, poor drivability, and triggering the Check Engine Light (CEL).
What We’re Seeing in Testing
- The Pro/TH airbox has a higher airflow ceiling, meaning it can measure more air before the MAF maxes out. This suggests improved overall airflow capacity compared to the stock airbox.
- With its separate fender duct (snorkel on the TH, capped duct on the Pro), restriction is likely reduced compared to stock.
- Toyota doesn’t claim horsepower gains on the Pro intake (and even shows a decrease on the TH due to snorkel restriction), but the increased airflow capacity may offer performance benefits once recalibrated
The Solution: Proper MAF Calibration
Custom MAF calibration is required to make these intakes function correctly on non-Pro/TH Tacomas. By updating the ECU’s airflow tables, we ensure:
- Correct air-fuel ratios
- Elimination of CELs
- Optimized performance under the curve
- Long-term reliability
At the time of release of our 6th Gen 4Runner calibration, OTT began offering calibration services specifically for Pro/TH intake swaps. This means owners of standard and hybrid 4Runners will be able to run TRD Pro or TH intakes with confidence and without drivability issues.
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