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Very minimal with ANY mod without a tune.
I had every bolt on available with short headers and stock cats and it made IIRC 307 to the wheels without a tune. Picked up close to 70 at the tires with long tubes, high flow cats and a tune
I've said it here before. The newer vehicles will automatically take into consideration and change a little, but for the mods TRUE potential, you need to tune it. Tuning will make a HUGE difference. Especially if you man up and go custom for your mods.
A lot of it isn't even the tuner giving you power. It's how it manipulates the computer BS that frees up some power. Like the torque management garbage and etc.
I put my diablo on and turned the Throttle sensitivity all the way up and made it a lot more fun to drive even just on the 87.
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