Post #3
I usually jack up the rear of the car and place it on stands. If replacing the intermediate pipe I leave the backbox hanging around in it's place. I connect the pipes put leave the clamps loose to make adjustments. The intermediate pipe likes to twist a bit downwards and it's quite hard to keep it up when trying to tighten the front clamp (best place to twist is the corner part under the fuel tank).
Then when the pipe is where it should, first tighten the front clamp maybe with some exhaust cement to stop small leaks. With the backbox, I usually drag myself under it and twist and turn it until it meets the intermediate pipe while being right in the middle of the cut in the bumber. Then when the right position is found - clamp it up.
This is the way I've done 306s over the years.. Nothing special, you'll probably still do it your own way
________________________________________
306 S16 "Peugeot Sport GrpN" '94, 405 Mi16 "OEM+" '89, 605 SV24 "Executive Express" '91