well probably more then 5k as I changed it 3 times originally and then altered it another 3 times......... reason being first 3 times I couldn't get the sound right, then I got pacers and it changed it again.......... so I had some work done, then with my dyno my stock cats kept causing catalyst overtemp to kick in (not to mention the speed bump issue etc) ........ so I had hi-flows fitted, again changing sound so I had some more work done to fix it etc........
You can imagine.... I'm happy with it now, but I think having a twin outlet would give more top end but I dont really care about that. It's staying how it is, it's been a nightmare to get the right sound.... and performance.