You can still keep using a dual 2.5" exhaust while boosted, and it won't be too much of a power loss compared to a dual 3".
Also, you can do flex fuel and a full fuel system before going boosted, along with the CJM oil pan.
For more cooling, you can upgrade your radiator and add an oil cooler beforehand.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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