Have been waiting for hole to appear in my exhaust which is a good enough reason to replace it with a Performance one

Im running a stage 1 R-tech map on a aum 1.8t. Ive looked at militek and sounds nob on but then it goes on about big bore down pipe, cat back, high flow sports cat and so on

This may seem all straight forward to you guys

but what im after is take the old one off, put my new one on and away i go, but obviously want the whole package as i'll be crawling under the car and dont wanna be under there again for a while

Dont mind spending around £400
What kind of trouble will i come across when fitting if any? (i got ramps and plenty of kit)
Thanks.