Transient response will not be the same. Pulls from low rpm in high gear probably won't show much difference. If you have a close ratio box or high stall the efr probably isn't worth the extra cash.

 

There has been a SXE 369 dyno sheet posted and it is significantly laggier then then the 66mm SXE or old school SX 66mm, which is should be it is a 69mm. Compared to the EFR 9180 it is not even close.

A EFR 69mm would be great! Makes a lot of sense. The exhaust side would be the same as the current EFR 9180, which is the biggest Borg Warner can go currently I hear. Spool would still be worst the the current EFR 9180 but would be ridiculous for 69mm!