Not knowing who the un-named place is, I can only suggest a specialist place such as Revlimits 9470 2444 or Maximum Motorsport 9249 7444. Thats the two I have used.

Otherwise perhaps Tenagah 9408 0600 or Racetorque 9302 6388. I've not had work done at either of the latter, but Abdus at Tenagah is great to deal with and the guys who use Racetorque seem to be happy. Revlimits is probably the closest to you if you're in Gosnells.

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meh