i have a gsr swap in my hatch and before i purchase an exhaust i want to know if the 2.5" and 2.25" flanges will line up. i plan on getting hytech replica header and i already have a 2.5" adjustable test pipe for the hytech replica. i would like to go with 2.25" exhaust so my car will not be as loud. i commute 100 miles a day and the loud exhaust tones get annoying really fast. will the 3 bolt flanges line up on the 2.25" exhaust and 2.5" test pipe? i am looking at purchasing the kteller 2.25" exhaust

 

i recently had a 2.5 header pipe bolt onto a 2.25 exhaust piping. should be fine as long as the flanges fit, im my case it didnt. the mufler shop had to use one of their custom flanges.