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I have a cortex for my 07 Tahoe. I am told i cant use a cia and that the only tune that will give me power is the performance tune, and the 87 octane and tow tunes are same as stock. Why is this. I can do an cat back and a cia to get better perfomance than the programer. I talked to hypertec and bully dog, they both make a programer that will give me more than one useable tune (with a few more hp than the SC) and i can also run coldair intake with there programers. Can someone tell me why there programers can with more power gain and SC does not.

On that specific motor, we could not make any more safe quotable power over stock.
This would mean that your motor is more finely tuned from factory.

We have tested this vehicle on the street and on our dyno.

A CAI and catback will not reduce the computers torque management quicken your throttle, firm your shifts raise the shift patterns, and have the variation to switch programs based on needs.

A CAI and catback will make you loose a little bottom end to give you a little more mid range and make it a little quicker in the rpms.

Ron

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