well - I was in the market for a is, and I could have spent an extra $8K or so over what I paid for my 4.6is on a 4.8is. I saw no reason to do so. HP is only 5 more for the 4.8. Ya - there are some updates, but nothing that I felt was worth anywhere near that kind of premium.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9