i just bought a "high flow cat" off ebay (i know its a straight pipe, its what i wanted)

anyway, the straight pipe doesn't have a hole for the second O2 sensor...what the heck should i do? can a shop do it or can i drill a hole that will allow the o2 sensor to be screwed in?

i like doing things myself plus i assume a shop wouldn't do this procedure b/c it is obviously against the law?

thanks,
andrew