The HS05SW1HDR Invidia header is a top - notch bolt - on upgrade for those aiming for a Full Bolt - On (FBO) setup. It fits various Subaru models, including the 2004 - 2021 WRX STi, 2006 - 2014 Impreza WRX, and 2002 - 2005 Impreza WRX (which must have a 2.5L oil pan). Key features include equal length runners for better performance, 304 stainless steel construction for durability, a 2 - bolt style up pipe, and 1.65 - inch diameter runners. Switching from the factory unequal length manifold to this equal length stainless - steel header will not only boost power but also look much cooler than the stock cast manifold. Keep an eye on Cylinder 4!
Using this Invidia header is easy. First, make sure your Subaru model is one of the compatible ones listed in the fitment information. If you have a 2002 - 2005 Subaru Impreza WRX, double - check that you have a 2.5L oil pan. Installation is a bolt - on process, but if you're not experienced with car parts installation, it's a good idea to get help from a professional. As for maintenance, since it's made of 304 stainless steel, it's quite durable. Regularly check the bolts to ensure they're tight. If you notice any signs of rust or damage, address it right away to keep the header performing well and looking great. And always be aware of Cylinder 4 during the whole process.
