Killer B DIY Holy Header Rotated Turbo Subaru WRX 2002-2014 / STI 2004-2021 | HH-DIY

Part #: HH - DIY. The Killer B Motorsport Holy Header is a top - notch exhaust header crafted with state - of - the - art CAD software and simulations. It's designed to supercharge your engine's power in the mid to high RPM range. With short primaries and a single secondary, it slashes header volume, enabling rapid exhaust gas pressure build - up. The symmetrical 4 - 1 design keeps exhaust velocity high and steady as RPMs climb, giving you faster spool - up time compared to long primary/double secondary designs. You'll instantly notice improved throttle response and the ability to hold more power at higher revs. **Key Features:** - Short Equal Length Primaries: The shortest possible on an Equal Length header. Less volume means quicker spool - up. - Symmetrical Primary Design: All primaries have similar tube length and bend geometry, ensuring high and consistent pulse velocities. - Smooth Mandrel Bends: Large, smooth bends for unrestricted exhaust flow, for optimal performance. - Thick Walled 321 Stainless Steel: Alloyed with titanium, it's perfect for high - temperature turbocharged engines. Unlike 304 stainless, it won't become brittle and crack. - High Heat Retention: Conducts less heat than 304 stainless, increasing turbine efficiency. You can ceramic coat or wrap it without voiding the warranty. - Included Up - Pipe Components: Comes with an up - pipe to manifold V - band (not welded) and a non - trimmed or welded 321 stainless steel up - pipe. - No Turbo Flange: Turbo flange is not provided. - Compatible Oil Pans: Works with OEM EJ25 oil pans and Killer B Motorsport Performance Aluminum Oil Pan. - No External WasteGate Accommodation: There's no provision for an external wastegate. - Flexible Turbo Setup: Allows placement of the up - pipe for almost any rotated turbocharger setup. - DIY Cost - Saving: A cost - effective option for DIYers. **Fitment:** - 2002 - 2014 WRX - 2004 - 2017 STI - 2004 - 2013 Forester XT - 2005 - 2009 Legacy GT - 2005 - 2009 Outback XT **Notes:** - 2002 - 2005 WRX needs a 2.5L STI oil pan. - 2006 - 2007 WRX requires an STI oil cooler and STI oil pan. **Important:** Not legal for sale or use in California on any emission - controlled motor vehicle.

Using this Killer B Holy Header is a great way to boost your Subaru's performance. First, make sure to check the fitment details to ensure it matches your vehicle model and year. If you have a 2002 - 2005 WRX, you'll need to install a 2.5L STI oil pan, and for 2006 - 2007 WRX, an STI oil cooler and oil pan are required. When installing, follow the standard automotive installation procedures. You'll find that the included up - pipe to manifold V - band and the 321 stainless steel up - pipe are there to help you with the connection. Remember, the turbo flange is not provided, so you'll need to sort that out separately. As for maintenance, the 321 stainless steel construction is very durable. However, if you choose to ceramic coat or wrap the headers, it's a good idea to check the coating or wrapping periodically for any signs of wear. Also, keep an eye on the exhaust system in general for any unusual noises or leaks. Finally, always remember that this product is not legal for sale or use in California on emission - controlled motor vehicles. Make sure you comply with local regulations when using it.