The Perrin Performance equal length Subaru header for the 05-09 Legacy GT is one of the most popular Subaru aftermarket header choices due to proven power gains of up to 30 wheel horsepower and 30lbs of torque on a slightly modified Legacy GT! The Perrin manifold is a true equal length Legacy GT header constructed of full T304 stainless steel. The Perrin Performance 05-09 Legacy GT header is designed to make large power gains without sacrificing low end power. Flanged for a stock uppipe, the Perrin header is compatible with stock location uppipes, including those included with rotated mount turbo kits, making the Perrin manifold an excellent choice for big turbo Subarus. If you are looking for huge power gains, this is the header for you.