Originally Posted by Capt. Type R
what kind of modification would have to be done to the cat for the jdm 4-1 to fit? and if i didn't put on an exhaust right away, would i be sacrificing power and possibly damage the car or engine?
thanks for the feed back. it's been really helpful.
As someone else has said, you would have to get a custom cat (like SMSP) to mate the header to the USDM exhaust.
You would be sacrificing the power that you could be getting, but you will still definitely feel the difference by adding a JDM OEM header to your USDM exhaust.
You will not harm the motor in any way.