Jp did mine and didn't extend the lambda wires or re route them away from the exhaust, hence melted wires screwed lambda and nearly a fried ecu, plus unknown maybe internal damage to the engine.
I wasn't a happy bunny plus they scrapped my old stainless system rather than putting it in the boot so I could resell it and they don't have a pipe bender bigger than 2.5 at the time and couldn't modify the bends.
To say I was angry was an understatement from now on it maybe a 6 hour round trip but I'm going were phillis goes A.A.S of Newcastle .