well the way i see it is that the 2.5" might be too big & give me that hollow gurgley sound, which i don't want. since, according to that chart, the 2.25" would flow better/have better pressure for my motor & it'll give a little more definition to my exhaust note, the smaller pipe sounds like the better option.

now i'm to the point of trying to find somebody with a similar setup that i can hear a video of