You want have to do anything to the computer itself and no chip is needed for what your planning on doing.
Sonic is right in one respect, your going to loss a little power due to the 70 mm TB. I would stick with 65 mm as the max size, unless your buying these parts for future plans like a stroker motor or a blower. If thats your plan, your right on track for now.
I will say I've seen on more than once occasion cars make over 400 rwhp with a 65 mm TB on them.
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91 single turbo vert
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