Is there a preferred/proven one to go for?
Looking for one for our project. P1 engine and turbo if that makes a difference?

If you have one for sale, you could always contact me

 

Japspeed good mate put an add in wanted section

 

Any open mouth downpipe which is 3", tapering down to 2.5" for the rest of the exhaust system should do the job nicely

 

I don't think I can as I'm not a full member

 

Just a quick point to mention - when I fitted mine I had to shave the gearbox casing a little -as some fit better than others. Im still a little in the dark over the separation issue too - have read that its better to have a pipe that separates the wastegate gasses till further down the exhaust to get better flow than just an open bellmouth.
I have the bellmouth and seems to be fine as with so many others but never did get a definitive answer over which is best.
The ozzy tuners seem to say separate the gasses but....??