plan on doing a 2.5 full exhaust. w/ high flow cat, help Options

[x_itchy_b_x]

So like the topis claims i plan on doing a 2.5 full exhaust. w/ high flow cat. BUT will i pass emissions with a high flow? anybody do it? i know i wont pass with the turbo. least i dont think i will. so i can take that off. but i cant jsut swap in an out a highflow cat and my stock cat on a custom exhaust. or can i? will the cat need to be DOT approved you think?

[Chrobis]

Technically no you wouldnt be able to pass smog. In all 96+ cars the smog laws changed, old system was OBD, new system OBDII (OBD 2). Almost every high flow cat on the market is only OBD compliant, because OBDII is insanely harder to pass emisions.

Although, even though most high flow cats are not OBDII compliant dosnt mean you wouldnt pass, but from research, and on paper you wouldnt pass, real world tends to differ usually