aparantly there is something about the gudgeon pins being to small or loose or something with the ACL pistons. And as for forged, i dont think any one manafactures forgies for a 4 litre. last i heard i had to send one of my pistons to the states for a custom grind. $3000 too!

I thought arias make forged pistons for the 4.0. After all that's what's in the atomic bottom end kits.