yep. . you can get the smooth clamps for butt conntections... and you can get the expanded clamp for when you have a flared pipe that has a non flared pipe inserted. same clamps are used for flexpipe... any truck shop will have the 4" and 5" styles of both in stock
***edit***
oops. . i guess i should read other peoples responces before i post my own. . the post above mine says the same stuff. .