Cats are easy enough to remove providing you have all the tools that necessary.
Y pipe you could get from traders here.
Take your time when removing cats
I have done most of mine. Regarding no 14 it was too long so I just didn't bother forcing it in so left the original nut in its place.
Haven't done the plenum yet as I am getting mine polished.
1. Spat - Blue
2. Cal - Red
3. Lmc-Blue
4. Lyndzzz - Blue
5. Ceejay - Red
6. Briggsybriggs1-blue
7. Paddy - Blue
8. HaydnH - Red
9. thetranquilbass - blue
10. Telboy83 - Blue
11. Almeida1234 -Blue