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what diameter is your crank pulley, and what is your shift point? an si is done around 750ish @ the wheels. a ti has seen north of 1000. id say a sizeable difference.
 

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right, i was thinking v1. in that case you will be moving more air at lower discharges with the ti. because of this you will see increased back pressure. how much is hard to say, and really it isnt a valuable metric to reflect power although there is a relationship. if youre @ 15 now and use same pulley config its reasonable to assume youll be 18-20. but again really a meaningless value. maybe look into alcohol/h2o injection to buy some advance, but e85 will offer similiar results. good luck sounds like itll rip.
 
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