You got ripped HG turbos have alot better response and at half the price. That workshop wanted to milk you haha. Post back ur results though to late to change.
If u were in Perth i could lend u wheels as for the exhaust no cables ties wont be passed unless u hide them pretty good. Take it to an exhaust shop I'm sure they could make u up a bracket to keep it higher for under $100
Don't do that to your car :/// UR car looks good as is no fake tint :// but if U like it then it's your car and your opinion so I say do what you like best. Just my opinion champ. Good luck looks good