Re: 1.8L header
The 1.8 beta exhaust manifold is better then the 2.0l exhaust manifold but not better then a quality aftermarket header. If n/a power gains is what you are after, I would look at some of the many headers available for the Beta such as the ones we sell, or from other places such as Mussa, kspec and Team SR.
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There is a replacement for displacement. It is on 2 wheels and 600cc.
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