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87944turbo
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One problem with most custom turbos is getting them to physically fit in the space provided. Also, a turbo in this power range will likely require modification of the cross-over and downpipe to accomodate the larger turbine housing. So you would need to add modified cross-over and downpipe to your list. Also add MAF and custom software to your list. Realize that squeezing this much power from the stock 2.5L will likely result in a car with a very narrow powerband. Stepping the displacement up to a 2.8L or a 3L will go to great lengths to alleviate this issue. Realistically, if your going to be making 450whp, you need to take a serious look at your suspension, fueling, braking system, safety equipment, clutch, transmission, etc. and make sure that they are all up to the task of handling more the twice the power that the car was originally designed for. You may want to check out Lindsey Racing and Speed Force Racing as well as Vitesse for more information. HTH.