Aftermarket Exhaust Question

I can buy a used ss Yoshimira (I think he meant Yoshimura) cat-back system for $150.  I cannot find any info on on their automotive exhaust. Any recommendations? Also, I am new to the import performance world. Can I just bolt on a perfomance exhaust system to my bone stock 93 EX without getting the CEL? Thanks for any info.

Yoshimura makes sportbike and atv components, so how you would fit that to yor vehicle I don't know. Maybe you mean Yonaka? You can look here at a variety of makers of catbacks for the Accord
http://www.horsepowerfreaks.com/performanceparts/Honda/Accord/Exhaust/Exhaust_Systems

ANd yes you can bolt one right up and you won't get any CEL or other warnings.