S4 turbo down pipe bs s5 turbo down pipe
 

I need to buy a down pipe and I need to know If their is a difference between the s5 and s4 turbo flange could any one solve my problem I've heard they are interchangeable but I want to be sure before I buy one

Their the same. I put a series five turbo on my series four and there's no difference in the mating flanges. No problem at all for me.

Same thing.

Ok thanks guys you've been a good help