Just thought of something, that catted y-pipe would keep the single exhaust then? Would it only be good for single exhaust then because I know duals don't generally use y-pipes if they ever do.

 

no they use x pipes or h pipes

 

Those jba's are exactly like my ebay headers i bet they are built at the same factory, ya mine are just the stainless steel so they have turned colors but they make my car soud very nice with my duals and i have noticed a little better get up and go with the headers on, i do have a tune but i put the headers on after i had gotten the tune