it lines up perfectly, aswell the weld connecting to the chassis broke, so thats being help with 3 zip ties, and the exhaust mount is lowered all the way to limit tension on the exhaust. however my buddy with the same bike un welded in the same spot.
heres the bike : http://www.daymak.com/bikes-toronto/pages/pocket/f249deluxe.html
PB Parts has a nice Fatty Exhaust w/ grooved gas tank to clear it for $69, they have a decent chrome under exhaust for $39, have 2 of them or a $69 SS ProJet exhaust. I got a twin tip and big muffler exhaust in Canada on ebay for less than $20.
Okay, so I'm understanding that it's the weld for the mount on the back of the pipe, where it attaches to the frame? is that the one? If so, what I do is mount up the exhaust to the engine, see how far off the mounting is between the tail end of the pipe and the frame mount, then fab up a simple extension bracket between the two. One of my bikes has the exhaust pipe a full inch away from the mounting bracket on the frame - I used a cheap wrench from IKEA bent 90* on either end to bridge the gap.
Ah, so it broke in front of the belly? Okay, that makes more sense. Shouldn't be too hard to weld it back up again. Try doing the vibration mod, too - it'll help lessen the engine vibrations that cracked the pipe in the first place. Otherwise, those pipes that EPR posted up are decent ones for your bike.
And technically, there are several welds on the pipe: on either end of the belly (header and peashooter), the stock muffler endcap, and the exhaust port plate.
Check in the air-cooled mods section for the hardware shopping list. it gives a listing of all the bolts you need to replace the bad ones on a stock Cag. It also includes the extra-long bolts you need to do the vibration reduction mod, which is basically sandwiching the frame between bonded washers, two per bolt. You would need new bolts for the bottom engine mount (4 6mmx20's), new bolts for the top engine mount (two 5mmx12's, 1 6mmx20), and one for the rear exhaust mount (1 6mmx20). On each of those bolts, you need two washers - one on either side of the frame - to isolate the vibrations.