I’m just trying to make sure things will work. I see a lot of direct fit aftermarket catalytic converters and exhaust systems however they range from 2.25” to 3” diameters. Is it safe to assume it’s in fact direct fit/bolt in no other modifications would be needed regardless of diameter size? Currently I’m looking at the Megan racing system and it shows 3” diameter and the only thing that come close to a HFC is a magnaflow that has the option of 2.25” and 2.5” diameter. Does the size differences pose problems? Or is it truly direct fit and as simple as just putting them on?