My exhaust is 3inches and the pipe from the turbo is only 2.5inches, how should I connect the two? if I slide the 3 inch pipe over the other the weld will look sloppy because there is to much of a gap. Is there any temp. way to connect the two so I can drive the vehicle to the exhaust shop and have them deal with it?

 

Take the pipe ( the one the turbo mounts on) and have the exhaust shop expand it.
I have done this many times and it will take alot of expansion.
Make sure to keep anything from getting in the turbo

 

and tell the exhaust shop to not whine about it splitting mine didnt