Im thinking about upgrading my down pipe to a race beat down pipe which is 2.75" but I dont know if its worth it? Anyone know what " a stock s5 TII has? And how much horse powper I might gain if i did the swap?

 

you cannot just upgrade the downpipe...unless you get an adapter to make it narrow back down to the 2.5..i say just save up and get the rb turbo back duals..mind train makes a 2.5 straight down pipe if looking for a little extra hp though..

 

Least you getting racingbeat. None of that cheap stuff that'll just melt.
Racingbeat know the size and what to do. As with previous post, just get the full system instead of just a downpipe.

 

Alright I'll check into the duals.

my car was leaking between the downpipe and the flange and since i've fixed it I've noticed a decrease in hp.