4.0L Only. Shortie Headers are designed with ease of installation in mind. Many late model applications do not allow use of a Tri-Y or Long Tube design because of emissions compliance standards. In those cases, our Shortie design is utilized in all RPM ranges for maximum performance while maintaining EO compliance and approval.
The proof is in the dyno! Our FJ Cruiser gained 18hp and 26ft. lbs. of torque!
- PRIMARY/COLLECTOR: 1 1/2" - 2 1/4"
- DRIVE: 2WD & 4WD
Installation Instructions for: Doug Thorley TRI-Y Headers
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