Angle Grinder.........0.5m of 2.25" exhust piping....... a mig welder.... = cat back system
Screw driver + cat convert = highflow cat, also smelly cat...
everyone talks about drone, but in reallity ive heard $1000 systems drone, its all about the engine not the exhust, id save your money and get something more worth while to change the engine note...
if you wanted to do it properly id do it from the headers back, run dual 2.25" into 2 STOCK cats, then 1 muffler on each exhust... seriously that will give u the flow and a BETTER note and if you do it right should cost u round $500, talk to VP luke he has a dual 3" system that cost him like $900 with extractors ( i think )
but to be honost, brutally honost.... unless you have the flow then theres no point unless you want it for noise.... its like when my mate put a 3" system on his 2.0L 4 banger...... do some research and decide what exhust you want, do you want to go forced induction? or keep it N/A...