Originally Posted by flyromeo3
a hi -flow cat has no restrictions. Meaning the exhaust fumes will flow right through.
Sort of like when your muffler falls off the highway and you get that nasty exhaust tone.
One thing, depending on your state, chances are all of them. You will not pass emissions because more junk is coming out of the exhaust.
I think you might be thinking about a test pipe which has not restrictions at all. before I had my cat installed there is definately some sort of restriction as I could not see thru it at all. I have an OBDII high flow cat and I pass emmisions with out any problems and Mass is some what strict. not as bad as Cali, but they are still some what strict. you should be able to pick up a highflow for $150-200. If you get an OBDII highflow cat you shouldn't run into a problem. I used to have a generic highflow that was not OBDII and it did throw codes. I've since changed over to an OBDII highflow and haven't had a problem.