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So guys i think my Gen3 outbacks rotors may be warped/had it.

Braking at high speeds i get really bad shuddering in the steering wheel, i'm guessing its the rotors, and if so can anyone recommend where to get good quality replacements?
I've been looking at ones on ebay (approx $100 for a pair). Wondering if theres a difference between say the ones on ebay and the ones you'd get from repco/supercheapauto etc.

Is it most likely rotors, or could something else be causing this?
Any help would be great!

What you are describing sounds very much like warped discs.

If there is plenty of steel left on the rotors you could always get them machined. Many places can machine them without removing them from the vehicle and it is a job that doesn't take much time. Get a set of new pads to take with you when you get it done and have them changed at the same time.
If you can do the work yourself then new rotors are not a hard job.

Could also be shinny discs and cheap brake pads. I'd try and skim the rotors first (as long as they're within spec) and fit good quality pads.