shorty header and hi flow cat

What will a shorty header and a hi flow cat do to my base rsx. Is it legal and will it pass emissions?

I think that'l legal but you'll gain little. Maybe 5-10hp. An intake gains more and once combined with Hondata products it'll do good.

If you install the header and cat in conjunction with the intake, a good exhaust and Hondata you'll be chillin...and still pass emissions.