You could have googled them lol.

Performance Exhaust
9870 4977
On New Street in Ringwood (hang a right as you're coming down Whitehorse/Maroondah and it's on your left)


My jobs were small - installing cat-backs that I already had etc. They can usually do things like that on the day or the day after. My brother had his XForce header, Magnaflow cat, FGK powergetter cat-back installed (including some flex pipe etc) in about 1.5 hours.

Their price is decent. Ask about warranty.