Just buy the sd headers and a 3" weld in cat from zzp. You can weld it in with a regular wire feed even though its stainless. You will need to do the fouler trick with the rear o2 because ANY cat other then the factory cat will set a p0420 catalist inefficiency and you will fail emissions. Thats ok though because the fouler trick costs 3$. Later on when you get further into modding you can delete the rear o2 codes and then replace the rear o2 with a wideband for tuning.