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[QUOTE="jmics19067, post: 335036, member: 27963"]
light gauge tubing  would be refering to  thin wall pipe

Pipe and tubing are classified as being different even though they are the same shape.  Most of the differences    is that  pipe  is measured by inside diameter  and by bursting strength<strictly related  to something flowing inside >   while tubing  is measured by outside diameter  wall thickness and the physical characteristics  of the shape, size ,and material  for  structural construction. 
 I would have  no clue as to what conduit would be considered  since it really does neither.  For  your  intentions  most exhaust shops  buy straight tubing  to  make  exhaust pipes.  
If you feel  like waiting  J.C.Whitney Co   sells   mandrel bent  tubing  in different sizes and shapes thru their  mail order  magazines.  ie   180degree bend, 3"radius, 1 3/8" tubing or  90 degree bend, 6 "radius ,1 1/2 tubing.   You  will    have to weld on the straight sections     but  atleast    you wont have a kink in the middle of the bend  from  bending   or  cutting  at an angle and welding back together
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