what should the idle be on these cara?I just put long tubes,o-r-x pipe and cai with a tube k member and I think it addes more vibra. than it should just from the low idle.when I look at options on my SCT ,it has a check by 600 or 650.if I change it when I then load the tune it idles to 300rpm ,has no throttle response then dies.if I load the tune and hit default setting if runs fine but has low idle when warm.