Cars that were expensive new, have expensive parts in them. If you replace a part with a new part, guess what, it will be a new expensive part. That's why alot of really expensive cars drop in value so much once the warrenty is up. I had a 2001 Infinity Q45 that needed spark plugs. guess what, that was 800 bucks. WAY more than you would pay to do plugs on a truck with a V8 in it.