Think its a 4 inch outlet. Yeah you get 2 controlls with each Muffler. Its not a full exhaust cat back, i have cut out the resonator and added the 2 mufflers. I paid $1300 which might have been abit more then it should, but i dont have much choice in exhaust shops where i live. Yeah mate pretty much spot on stock, really is great when your on the open road and want to shut it up. Warranty mate, thats a grey area like disscussed on this forum some think it will affect, some think it wont. I didnt plan to have any engine trouble in the next year and a half so it didnt bother me:p. Just a question on adding pics also. I used the add image button and linked it from another site i uploaded it on.. Not sure about this attatchment system, its telling me 'Attachment space used 2.91MB of 1000K' when i havent attatched anything!??