if you plan to spend lots more then just the initial payment for the engine then the AGU has a slight advantage over the others. If you want power out of the box with 300bhp possible then buy a 225bhp lump on day 1. The AGU lump will need new injectors, fueling system and turbo to get it up to where you'd be already with a BAM lump. If you're going IHI route for 350bhp+ then get a AGU lump as you'll have to replace the aforementioned anyway.
I'm running a AUQ lump in the dodgyiest conversion ever, but I've fixed most of my problems and it runs sweet and reliabley everyday now.
There is lots to read about the engine. I advise you read it before parting with your cash. I wish I did now!
