Look in the for sale section, people are always selling dump/front pipes and you will save alot of money buying one 2nd hand then buying one new, as for the cat if you don't have a highflow one try the Just Jap high flow cat there like $160 delivered for sau member and alot of people from here have used them on there cars and said they work perfectly.
But if you want something made up you can't go past Exhaust Technology on goodwood road hes a bit pricey but you get what you pay for and his work is top notch.