We provide several engine packages at BTWTuning. The most straightforward approach to increase power is by upgrading the rods and pistons. This modification should ensure reliability up to around 650 wtq or 800 whp. However, I advise against pushing beyond these levels on the VQ37 engine. We've done a few CSS blocks as well but haven't pushed them to the limits yet.
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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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