Mac off road h pipe

I was just wondering whats the difference between the Mac off road pipe that cost about 119.00 and the coated one thats 157.00 is it for the head or what? i just ordered the 119.00 because its cheaper haha but i was just wondering if the sound would be any different or anything?
 
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I got the cheap Mac 2 1/2" off-road h-pipe with my mac long tubes and custom exhaust with flowmaster 40's. my car is insanely loud but every person who has a mustang has been trying to get there's like mine by using expensive parts like jba, magnaflow. i honestly haven't heard a better sounding mustang then mine.