At 400+hp, What kills A904s?

You guys sure do waste a lot of posts NOT stating the price you paid for your racing 904s...What's up with that? VERY suspicious. I've seen them for $4K and more. How much was YOURS?? OR should I post that question in the Racers Forum??
I have 3 of them all identical, 2 are in cars and i have 1 sitting on the shelf just because.....3700 dollars a piece.....happy now? I sure am..... as I race it, street drive it and pound the balls off of it and have zero problems.