Since it does not have torque, it will need a lot more to feel an gains as Toyotas were not meant to be made into "fast Cars". HP will not make car any faster and may make perform less by adding as torque gives pick up. Stock is 140HP and 125 Torque. GTS is 180 HP and 135 torque and they are pretty much both as quick as each other as example.
Want a gain? Put all synthetic fluids in all places that take it such as power steering, rear end, tranny and oil. This reduces friction and may add for 100.00 20-25 HP and same in torque. What you plan will not gain half and cost almost 1,000.00 to get maybe less performance and engine life.
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