I have a 01 ex and installed a obx header and downpipe w/a high flow cat. Ever since I installed the high flow cat my check engine light came on and the car now boggs occasionally. What should I do? Or should i put some type of o2 modification in.

 

is the secondary o2 sensor hooked up?

 

yes both are hooked up

 

Is your "high flow cat" actually a converter, or just a straight pipe?

 

^+1 they sell test pipes on ebay but they are labeled as "high flow cat" even though they're just a straight pipe or resonator