Custom exhaust Q's

[jm1681]

I did a quick search and came up with mixed opinions and tons of options. So, here goes with a few basic questions...

Pipe diameter. If one is looking to keep things simple and stay NA, what is the best choice for pipe diameter? My gut tells me 2" and apparently a couple people agree.

Resonators. If one does indeed go with 2" piping, is a resonator required to keep the noise below "legal" (And I use that term loosely as most cops simply use their own discretion) and bearable limits? I'd like to avoid it for several reasons.

Mufflers. I was looking at this muffler. My wife used this muffler on her Acura with great results in both sound and performance. Anyone have any experience with Magnaflow mufflers on their Yaris?