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You could always do the following...
Upgrade SC12 s/c to SC14 (found on JDM mid engine siennas i believe)
bigger better flowing IC
full exhuast nix the cat (illegal)
perf supercharger pulley (company in australia does alot of this, pm for details)
or since you do have forged internals that can handle it
remove the s/c
add turbo/tmic
bypass stock computer... add Motec/SAFC/insert your favorite here
full exhuast
set turbo to 12-14 psi and kick ass
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