Hi, I drive a Seat Leon Cupra R, but since I have the same engine as you (225 HP, 1.8T) and the Seat Forum is very busy, I open my thread here. I want to have an exhaust system built, probably at www.burdinski-tuning.com. In addition to sound improvements, of course, I also want to achieve a performance increase. And in that point I’m a bit unsure. Some say: “Ab Turbo best ein Rohr” , others say that the engine is a well known I know that the Cupra R original exhaust has an outside diameter of 68 mm and a tuning exhaust of Supersprint 63.5 mm inside diameter. This exhaust in conjunction with MSD replacement pipe, has caused a loss of power at different Cupra R ́s, because one then probably has too little congestion pressure. What do you think? In which size should I have my exhaust system built or which sizes have your systems and what are your experiences?