the core sizes are how they measure the IC's both versions are plenty big enough for high boost applications. I personally have the Z1 BA's on mine. A bit of side marker modification was needed to fit them, but I love that kind of stuff. IIRC I think thats the reason ash kept his just under the 10 inch mark but I may be wrong. long story short, if size matters to you, and you dont care about cutting stuff...z1 if you want a fantastic product with a bit less stress...ashspec if you really like the idea of breaking down on the side of the road... EBAY 99 percent of the parts from noted Z companies on here are going to be the best you can buy. It usually ends up being personal preference.
hope this helps
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