Depending on your build and where you live, I would recommend shopping price first before high-flow considerations. The stock cat actually flows quite well and is fine for stock or mild builds.

If your situation is one where high-flow is more important, I obtained the following information from the California Air Resources Board:

* The Car Sound (DBA Magnaflow) p/n 91304 is legal for OBDI applications (prior to 1996).
* The Car Sound Series 42000 is OBDII compliant for all Honda/Acura passenger cars.

The OBDI information pertains to GSR's