aFe Twisted Steel 409 SS Header (48-46201) enhances flow and performance for 1991–1999 Jeep Wrangler YJ 4.0L I6 with TIG-welded stainless steel construction. Built from 14-gauge 409 stainless steel tubing and engineered with optimized tube lengths and mitered collectors, this performance header improves exhaust velocity and increases horsepower and torque. The design features a 1/2" thick machined flange for a leak-free seal and is 100% TIG-welded by skilled craftsmen for durability. This header is a true bolt-on upgrade requiring no modifications, making it ideal for both on- and off-road performance enhancements.
Key Features :
Direct-fit header for 1991–1999 Jeep Wrangler YJ with 4.0L inline-6
Constructed from 14-gauge 409 stainless steel for durability
100% TIG-welded for race-level strength and longevity
Mitered collectors improve exhaust flow and velocity
1/2" thick head flange ensures leak-free seal and strength
Works with factory exhaust system with no modifications needed
Includes premium port-matched gasket with aluminum fire rings
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