so i have a downpipe from my 05 that my local exhaust guy is going to help me to fit it to the 08, my question is, is it alright to run a downpipe on the 08's without engine management. i heard when the 06's came out that due to the 2.5l they had boost spike but that was normally catless. i plan to run a high flow cat also. anyone running one? i am going to get a full custom tune as soon as the tactrix cables come out for the 08's..should i have it made and wait to put it on or what?