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A high performance headers is another step when comes to exhaust flow upgrade it helps improve exhaust flow, turbo spool and increase hp. Headers are available in equal length and unequal length designs. Unequal length headers improve exhaust flow yet still retain the factory 4 into 1 design keeping the distinct Subaru boxer sound. Equal length headers will deliver the most noticeable gains in turbo spool and power across the RPM range, however, they change the factory header configuration to a 4-2-1 design that will eliminate the signature boxer sound.