The above link is 3" exhaust with 14" Dynomax ultraflo muffler. Sounds rather loud to me. check his other videos, he has done alot of research on diffrent mufflers.
3" will be a lot louder than a 2.5, or 2.25 for that matter, system.
I just got into a discussion with a coworker (Ford racer) on this exact topic and he swears up & down that in regards to sound the size of the exhaust system has virtually zero effect on volume, it only effects the tone. I told him he was nuts. He's bringing me before & after video to watch of his Mustang when it had 2.5" and now with 3". He claims I won't believe my ears and is insisting just as a tip to not waste money on larger exhaust for purposes of sound alone. I'll see soon enough.
The Ford racer is nuts. Given the same set up (brands/configuration) a change from 2.25 to 2.5 to 3.0 will make a BIG difference. I would not consider anything over 2.5 as quiet, it even in the 2.5 size you have to pic the muffs carefully if the motor is stout and you want quiet.
and not to go off-topic but once again I am reminded of my question Why no 2.75" pipes/muffs? Seems like such an ideal size. Not quiet though.
