GrimmSpeed Unequal Length Header 2 Bolt WRX / STI

Description:
This is GrimmSpeed's new Unequal Length Header. Grimmspeed believes that there has not been any major changes to the unequal exhaust manifold in some time, and this is due to the tight geometry and long cross-pipe between the two collectors. Although it provides the Subaru with that signature boxer sound, it is not optimized for flow or power. This design is great for low-end spool, but the factory exhaust manifold runs out of steam higher in the rev range. To relieve this issue, other manufacturers would design a more equal-length header with larger diameter runners to make up for the performance. Because of these reasons, GrimmSpeed has created a header that would offer the best of both worlds meaning excellent power delivery throughout the entire RPM range, while still delivering that flagship boxer rumble.

Features:
- Full 304 stainless steel construction
- Innovative 1.5 to 1 unequal length runners - Equal length performance with an unequal length sound
- 4 into 1 low-angle merge cast collector ensures minimal restriction and maximum performance
- Smooth restriction-free flow throughout is accomplished with single-piece mandrel bent tubing welded to a single-piece merge collector to remove "steps"
- Substantial power and torque gains upon research netted +25 HP and +25 FT/LBS over stock
- Quickest spooling aftermarket header when compared to the competition
- No tune is required and safe to run
- Includes new gaskets and hardware for the installation
- Designed to clear aftermarket oil pans
- Manufactured and welded in the USA

Applications:
2002-2007 WRX
2004-2007 STI
2008-2014 WRX
2008-2014 STI
2015-2021 STI