So I contacted Cobb wondering if I could run stage 2 with a stock CBE and catted DP. They got back to me very fast and said it is completely safe because cat-backs do little - nothing restriction wise(noise makers). So I have $600, do I make my car a stage 2 sleeper with an Invidia CDP and Grimspeed heat shield or do I go suspension with sways and endlinks? My car is a DD and I do some mountain runs about once a month that I run decently hard. If you have any input please let me know what you think.