Quote:
Originally Posted by iBenJAMM1N
Since Z1 headers make more power over the stock manifolds, I'm willing to bet there is another 20-30whp, I remember someone was mention a while back who has done this before.
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I believe the Z1 headers are a different flange than you have on the stock VHR engine requiring customizing the turbo manifold. No longer a kit you can 'bolt-on' in your garage.
The one guy running the custom headers had to have the flanges shipped loose and a little custom piping fab work done.
The stock headers are not a power limiting issue. Right now for me the stock block is.