2012 Legacy H6

I am looking up upgrade my brakes and rotors. Aside from OEM, what is the best solution to achieving good performance and stopping power?

So they repaired everything except for the left side head gasket seep... so your recommendation would be to swap it with a JDM engine? 3K is for the engine alone? Or labor included?

It finally got worse. Had the trans fail to shift smoothly at 20mph twice in a row. Rpms went up but no power then BAM a hard slam of a shift. No check engine light. A week later I'm driving home and the lights started flashing along with a CEL. Upon acceleration- very weak power. Brought it to Subaru and sure enough its the valve body. Along with that they found external head gasket oil leak as well as one side of the valve cover, displaced control arm bushings, manifold leaks as well. All together the estimate is over 6K.

It happened again recently. I was accelerating slowly and the rpms went up weakly then I heard and felt the loud knock and thump. The fluid is good and it started at 96-97K. Has 98K now.

Hello please give me some advice. I am a new owner of a 2012 Legacy H6. I was just making a left turn and after completely releasing the gas after completing the turn, I heard and felt a significant single KNOCK. Almost as if I hit something but the knock corresponded with the downshift. I was able to recreate this knock once more with another downshift after releasing the gas pedal. There are no codes thrown (yet) and no other signs of a potentially failing transmission. Thank you in advance for any information you can provide.