go for a b18c7 with the lsd gear box....and keep ur turbo kit...
and run low boost without break the engine!
that will be huge gain cus the 1.8 ltr and high compress ratio just reduce the lag a lot,
also the type r gear box got really close gear ratio and lsd...give a better lap time and less wheel spinning....
but the bad thing is u need a really really good tune and good take care....or the engine gona blow....