Re: Oval or twin?
I used to have a powerflow exhaust on my mx3. Was a noisy bugger by choice, very chavvy of me, great little V6 thou. They are great for tuning the sound, they generally try different silencers and backboxes so you can tune the sound how you like.
I think the exhaust was the only thing not to rust on the mazda lol. Had it 4 years and no complaints from me! My mate religously fits them to every car he's had, saves money in the longrun due to being a lifetime fitment.
The only downside i saw was that the bends are crush bent and not mandrel. Don't lose much I wouldn't have thought, but the exhaust purists might argue otherwise...