The TA knock offs are certainly not a bolt on ( well maybe physically ). The port alignment needs modding, the v-band flanges are as cheap as it comes, and the head and turbo flanges are not straight. So with some good v-band flanges/clamps, turbo flange, welding, and grinding, I will have about $550-$600 into them and they will be right. I'm still $500 ahead. Maybe I should have gone TA's, but I did what I did. My stock headers are capable of 9's, so these should atleast go there. The reason that I went away from the stockers was to go external with the wastegate---I didn't want to cut my Jet hotted/ported stock pieces. If I were to be running an internal gate, I would still be stock.