If this is the Daytona engine, you need to try Cerberus' massive midrange tunes on t595.net - http://www.t595.net/kb/swapshop/index.asp?mid=9
If you cannot access these tunes, PM me your email address, and I can send a few different versions for your to try.
Dyno graph comparing Massive Midrange and later Massive2:
http://www.t595.net/kb/swapshop/dyno.asp?id=89&ie4=dyno.jpg
If you cannot access these tunes, PM me your email address, and I can send a few different versions for your to try.
Dyno graph comparing Massive Midrange and later Massive2:
http://www.t595.net/kb/swapshop/dyno.asp?id=89&ie4=dyno.jpg