I'm looking at a downpipe, and am thinking of perhaps buying a complete system and selling the cat back part of it, basically because i don't want my car to grab too much attention. I would like the exhaust note more audible because all i can hear is intake and engine noise, but i think i'd probably regret it...

Question is, if i get say the full apr 2.5" system and just use the downpipe w/high flow cat (yes i realise you can get the downpipe separetly), do i need to get any hardware to connect it to the stock turbo and stock exhaust (cat back)?

Also, how much would the installation costs be roughly for just a downpipe (with high flow cat)?
And how about installing the whole lot?

And this is probably a stupid question, but is welding required?

Thanks.

Oh and reccomended exhaust shops around lower north shore area, or castle hill area would be good too for when i need to get it done