i recently switched from my MAC to a used set of 2 chamber flows from some kid.... I noticed it go ALOT quieter which i do not like at all.. A friend of mine came over yesterday and he has the same setup as me, but he has stock headers.. His car sounded ALOT louder then mine and with a flowmaster tone SOOO noticible... This is what makes me think that my mufflers are not 2 chambers.. I am going to get new mufflers for christmas and i am not going to waste over 200 for a new set of 2 chamber mufflers installed IF they dont sound no different then my mufflers... How can i tell for sure which mufflers are on my car?? I am thinking about either running 1 chamber flows or magnapacks.... A reason magnapacks would be cool is that its only made for newer stangs.. ive never heard one on a 5.0 .. Both would require custom bending because of the center in and out... so far my exhaust is.. MAC equal length 1 5/8 headers, offroad H pipe, and these "so called" 2 chambers into 2 1/2 inch pipes.... What do you think??? A question for 1 chamber owners.... With tailpipes, will i absolutely lose that "flowmaster" sound??? if its all there, then i think I found my mufflers!