There is 3 AX53B70s the p21 is used as a twin set up on GTRs, the P25 is rated to 380hp, I have this it is really responsive and made 245rwkw at 14psi on my car, so there is a bit more in it yet and the P28 which is a big high mount job thats the 600hp one
The P25 would be a good choice Vish I love mine but you may have trouble getting one. Apexi turbos are rare these days! I know I have been unable to get my hands on a RX6 kit, websites say they have them but when you try to order they say they are out of stock