3 inch exaust?

my questions are, why so big on a 4 cylinder? and how the heck do you route the exaust without hanging too low, and can it even go over the rear axle?? i would like to put a side exaust on mine (have one now for the carbed n/a and i like it) my dilema is where to mount the muffler, without hanging too low. can anyone show me some pics of their exaust?
thanks
jeff
 
Stinger Looks Awsome.I now regret the single 3" I built for my car I thought we done a good job. No way. If these pictures aren't on your website they need to be Great looking.
 
yea, im getting a 2.3 turbo from a mrkur xr4ti in the next coupl weeks, and i was wondering what exhaust to use. ill be swapping it, into my 79 cobra. nothing will be too modified. a BOV boost contoller, exaust, and intercooler. maybe eventually an upper/ lower intake, fuel pressure regulator, throttle body ect.