2022+ WRX FA24 ‘Shorty’ J-Pipe Replacment
Hand-built performance. No compromises.
This isn’t a cookie-cutter exhaust mod.
Our Shorty J-Pipe is designed for the FA24 crowd that wants real gains, faster spool, and a cleaner engine bay—without breaking the bank or waiting months on end.
Specs:
• TIG welded in-house
• Mandrel bent 304SS tubing
• CNC flange fitment for a leak-free seal
• Compact design for easy install and minimal heat exposure
• Spaced O2 bungs included by default to help mitigate CELs (check engine lights)
***Compatible with Rae I-Pipe, the one that DOES NOT replace the stock J-Pipe section**
Two Versions Available:
• High Flow Catted Version
Featuring a GESI high-flow catalytic converter—EPA-compliant, no check engine lights, and engineered to handle high-heat, high-horsepower applications without sacrificing performance.
• Catless Race Version
For off-road and track use only. Comes with factory style O2 bungs + spaced bungs to help reduce fouling or CELs.
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Important Note on CELs & O2 Sensors
We're designing this pipe with emissions behavior in mind, and every unit comes with spaced O2 bungs to help reduce the chance of CELs or sensor issues.
However, due to variances in tuning, climate, sensor condition, and individual vehicle response, we do not guarantee a CEL-free experience.
We're not responsible for failed inspections, O2 sensor misreadings, or emissions-related compliance.
These are performance parts—install at your own risk, and ideally, with a tune and solid prep.
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Custom Options Available Upon Request
Email us to inquire about:
• 3.5” outlet size
• Inconel construction
• Resonated versions
• Turn-down dumps
• Or anything wild you want to build—we’re here for it.
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“Welded with Purpose. Designed to Perform.”
Built for enthusiasts, by an enthusiast.
Every J-Pipe is made to order and backed by Function Fabrication’s commitment to hustle, quality, and the pursuit of power
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Disclaimer:
We are not responsible for emissions compliance, inspection results, or street legality. Catless units are intended for race vehicles and off-road use only.
Function Fabrication Warranty Policy
We stand behind our welds, always.
At Function Fabrication, every part is hand-built and thoroughly inspected before it leaves our shop. Because of that, we proudly offer the following warranty:
• Lifetime Warranty on Weld Failures & Manufacturing Defects
If a weld cracks under normal use—or a defect from the fabrication process causes a failure—we’ll repair or replace it at no cost to you.
This applies to the original owner only.
• 3-Year Coverage on Materials & Fitment
If a flange warps, a bung comes loose, or a pipe shifts out of spec due to workmanship within 3 years—we’ll make it right.
This does not include damage from extreme abuse, accidents, or modifications done after sale.
• What’s Not Covered:
• Normal wear & tear (e.g. discoloration, surface rust in non-stainless components)
• Damage from improper installation, tuning, or use outside intended purpose
• Catalytic converter damage caused by tuning, oil burn, or rich conditions
• Use of our race-only parts on street-driven or emissions-controlled vehicles
Have an issue? Hit us up.
We’re not here to leave you stranded. If something goes wrong, send an email with clear photos and your original order info—we’ll get you sorted
