Going to have same result with avid as any other spacer 1.5" lift combined with eibach springs, a super tall rene!
I think the concern is the Avid 1.5 doesn't push down things like the Daystar 1.5 kit, so adding another 1" to 2" lift via Springs would (in theory) put more strain on the rear end and driveline of an Avid 1.5 BU over a Daystar 1.5 BU. That is just speculation on a few folks part I have read across a few forums/threads. Because of this, I was also wondering if the Avid 2.0 or 2.5 kit would be a better choice if one is going to add 2" lift springs as well. I am thinking in terms of % of variance rather than hard numbers in cm/mm/inches.