SportShifter Proficiency

can anyone tell me how proficient a "auto-manual" transmission is versus a manual, is there a BIG noticable difference? ( i just wanna know if it'd be worth time and money to do a auto --> manual conversion....

The SS is not a replacement for manual. Manual transmission is in the end much better, and will be able to outdo an SS counterpart in a straightline race. SS times are about in between a manual and an automatic.