Does anyone know where i can find a good mechanic that either specializes in performance upgrades for 380s in general? Or just an overall highly rated mechanic? Thanks, im from the Liverpool area, so anything around would be great.

'Performance upgrades' and '380' don't really go hand in hand.

You will need to suss out performance mods yourself, and get a relevant professional to install for you.

Sorry let me re-word that. As seeing your from Queensland you probably wouldn't know the answer but, does anyone know where i can performance parts (90mm intake, mufflers) in the Sydney area? Or a reliable mechanic that could install them for a reasonable price if and when i were to have them (once again, around Sydney)?

Sorry let me re-word that. As seeing your from Queensland you probably wouldn't know the answer but, does anyone know where i can performance parts (90mm intake, mufflers) in the Sydney area? Or a reliable mechanic that could install them for a reasonable price if and when i were to have them (once again, around Sydney)?
The 90mm intake is a genuine part available in America only - it is not an aftermarket part. Hence, you will need to order it yourself.