Cheers K, will try tonight then hopefully get lucky

Will update any results, thanks again.
Update: Worked!
To replace the values keep track of the length between the turbo values and HP multiplier (
28 00 00 64) For the first set, length must be 14B, starting from the offset E980/70 locate the
28 that belongs to the HP multiplier and go upwards till you reach the 14B length (ex offset E830/20). Now replace the next 01 value for
09. Repeat the steps for the length A8 (ex offset E8D0/E0) now replacing 09 D1 for
78 90. Now for the last set, length is 27 (ex offset E960/50) replace 00 00 00 to
12 34 56.
This also worked to make a NA engine, just swap the values to do it. All credit goes to Kevin.