I had a Borla on my 135 and I have the Akra on my 1M
Both cars had straight pipes in the middle (135 Borlas, 1M N55 pipe with a resonator delete)
The sound is VERY different. I want to say the Borla was louder but the Akra has opened up and is loud in its own right. Hard to determine which was louder.
The Akra has a more "euro" sound. The Borla had a good amount of drone compared.
I love the Akra sound. The craftsmanship is top notch. You cant go wrong with either but I think if I had to choose again the Akra is a no brainer.