my friend said that you can put a high flow cat on a set of race headers. has n e one done it on a focus..they did it on other cars so i assum u can do it on a focus as well. or would it be simpler to get shorty headers and a high flow cat and save the trouble.
AEM CAI w/ by pass valve, FC 65mm tb, steeda short shifter
more to come:-D
Check Out the New Hawaii Forum