8g Galant 2.4L OEM Exhaust specs (diameter)
 

Anyone know the piping diameter from the header to the main catalytic converter? I know Stock cat-back is 2.25 but I need to know if it bottle necks at the cat.

RE: 8g Galant 2.4L OEM Exhaust specs (diameter)
 

the downpipe wont be a smaller pipe than the cat back. I dont know anything about those cars but its gotta be at least the same. at most i cant see it being bigger than 2.5. Id say most likely its the same size

RE: 8g Galant 2.4L OEM Exhaust specs (diameter)
 

OK. Well I was just making sure. I'm new to this car as well. Thank you.