Sorry for the delayed response! High quality downpipes will not cause turbo surging with our software, so definitely stick with stage 1.Hi Connie. I just got your stage 1+ tune for my 17 golf R... and I love it! I am wondering, though, am I better off keeping it stage 1 and addind a downpipe... or going stage 2 with a downpipe? I hear that there might be some turbo surging with a down pipe in stage 1... but heat soak without an upgraded intercooler with stage 2. What are your thoughts? Thanks!