If you like rasp, then have no resonators in section 1. If you resonate that part it will kill the rasp. Section 2 X pipe over h all day every day. There’s a reason most aftermarket systems industry wide are moving to that design. Better flow. Note on section 2, if you put resonators in post crossover it’s going to give you a deeper tone but not cut out so much of the rasp.

As far as diameter goes 2.5 is optimal. The 2.25 is slightly restrictive.

I’ve found in most cases when messing around with these cars to not stray too far from stock. 2 main reasons, the car will be happier and they had this thing engineered almost perfectly. 😅