Hey Guys, will be posting this in the PCM Tuning section but wanted to ask it here as well...
Recently installed PLOG and ZZP 3" Catless DP on my 1999 GTP. There are no vaccuum leaks or anything like that and I replaced all the vac/boost lines to be sure. I have a lower temp T-Stat and the stock 3.8" supercharger pulley. Did some data logging yesterday and I am still seeing ~2 to 3 degrees of KR at WOT at different places in the RPM range. Anyone know why this is the case? Have you seen this regularly on stock GTPs with exhaust mods?? Figured I would have 0 KR after those mods without running more boost...
