Here is 526 whp on stock sleeves: http://www.honda-tech.com/zerothread?id=1267344

Here is 654 whp: http://www.honda-tech.com/zerothread?id=1355442

Here is 610 whp: http://www.honda-tech.com/zerothread?id=1290943

My point is that everyone runs and gets the sleeve blocked for a setup that won't even need it if they spent a fraction of what sleeves cost on a good tune.