I don't have any resonators in my car and it doesn't have any rasp when warm. Only a tad of rasp when the exhaust is cold which you shouldn't be rasping because that means high rpm with cold engine. Once the exhaust is hot though the tone is deep and head turning. Youtube videos can't show how good it sounds so you'll have to come hear it for yourself. LOL.

What changes in sound happen in general when you goto a larger single diameter from the headers to the muffler?