The blowing is still there after doing this?

[markallen]

Are you sure it's blowing from the joint? and hasn't got either a crack on the downpipe weld or a massive crack on the hot side of the turbo? Or you haven't got flat faces on your joints

If it was either of these why would it sound better with paste around the joint? 

[rio_gti]

Also I thought about a crack but in theory when it gets hot shouldn't the metal expand and the blowing get quieter??

[Jin_C]

Are you sure it's blowing from the joint? and hasn't got either a crack on the downpipe weld or a massive crack on the hot side of the turbo? Or you haven't got flat faces on your joints

If it was either of these why would it sound better with paste around the joint? 

Could it be because that it is blowing from two places. When you fix the downpipe joint you can hear the quieter one but before, the downpipe is drowning out the other gap

[markallen]

I guess I can only try and fix the joint first and then see what happens. Will update tomorrow when I've done it.

[Wazzzer]

Like Chris said you definitely shouldn't be using paste for any joint before the cat

[markallen]

Why though?

[stace110]

If you use the paste between the two flat surfaces ,The excess on the inside of the downpipe could break off and slightly block/damage the cat .

[markallen]

If I do and it sorts the blowing I will get a new downpipe without a cat anyway. It's just to try and source the blowing issue it's not going to be a forever job.

[golfyste]

Just change it all!
Uprated turbo and exhaust ..... Sorted 

[markallen]

Just change it all!
Uprated turbo and exhaust ..... Sorted 

I would but your shying away from fitting it all ha ha