I recently purchased what I was told was a 2.3 Whipple, Gen 1 blower for my 2003 Cobra. As a result of damage during shipment the blower was sent to Whipple for a rebuild. The blower was completely rebuilt and to my surprise the blower turned out not to be a Gen 1 W140AX but a 2300AX blower, pre-Gen I, one of the first lysholm compressors offered by Whipple for the 03/04 cobra. I know the Gen II is a little better than the Gen I and the Gen I is a little better than the 2300AX as far as output. I plan on having my car tuned on pump gas as soon as I get my fuel system finished up but I was wondering if I should show up at the tuner with a 3.25"/4# or a 3.00"/4# lower pulley combination? I am looking for around 19 psi. After doing a search I found several threads for the W140AX but not the 2300AX. Thanks.