Originally Posted by Epstein

Cons: It's heavy. Really heavy. Like, the difference in weight between an Altezza (4-cyl, 6speed) and IS300 (2JZ and 6-speed) is something like 350 pounds, all other things equal. ...and the Altezza's 4-cyl has an iron block. Exhaust comes out the other side of the motor, which is only different and not bad. Packaging in a straight 6 is always an issue. And unless you do a turbo upgrade, some one in a 50-trim KA is going to blow past you. Oh the irony, if that happens.

If you have the cash, go for it. It can't be that hard.