tom_kauf wrote:Is it for the sound? Because the stock even length headers don't produce that typical Boxer Rumble.
I don't have experience with any UEL headers, but I do prefer the sound they make (even if it is supposed to be less efficient).
Tom i'm not really sure what your asking? Your car is a Post face lift model...
Preface 04-06MY Libs have Equal length twin scroll headers, Post face 07-09MY Libs have Un-equal length single scroll headers.
Its the Un-equal length headers that produce the "Subie Rumble" as it produces uneven exhaust pulses between the engine banks (left Vs Right).
Equal length headers allow for proper exhaust port scavenging, this is why they are said to be better. The reality is that the headers will never really truly be equal length, and in most cases limited mainly by the turbo anyways.
No point upgrading the headers unless your going for a big turbo setup, as the turbo is a restriction aswell