I finally figured out why my car was running badly with the TH downpipe.For some reason I could run the alcohol pump speed at 7 1/2 with the stock downpipe but only at 5 1/2 with the TH downpipe or my car would be sluggish.I never felt the flutter that you are suppopsed to get with too much alcohol.Any way I have my car back in the 12's again but I seem to always run rich.Anyway I don't want to waste a lot of space here but if someone would like to take a look at a couple of turbo link files I can send you 2 with et,speed,etc to see what you think.I am trying to get someones opinion with more experience on these cars than me.Right now when I run good my 02's are always 800 to 810.Bruce