I have tried deciphering what they are doing, seems to get a true "drop in" you have to buy rods and pistons, the rods are heavier and the pistons are lighter so it comes out right as far as I can tell and the rod piston combo is waaay too much money for upgrading stock engines to everyday customers. Not a bad price if your looking to upgrade to handle more power though but the stock rods can't handle stock power. An e-mail to them has not been returned yet...

The SCATS are heavier and would need rebalanced