Actually the total cubic inch of the UAS front mount compared to the Greddy is about 6 times larger. That is counting both side mounts. 2,012.64 cubic inches (UAS) to 184.58 cubic inches x2 = 369.16 cubic inches (Greddy) . Unless I did my math wrong. I think that much more power could be made using a large front mount, even with the stock turbo considering they, at 15psi, are starting to get very inefficient. And the UAS unit should only be about $1200 US dollars.