Stay away from XS-power. They are a front for SSAutochrome...which happens to make top-notch products.
My favorite example of their workmanship is the epoxied compresser housing:
There are a few other examples with pictures (like the exhaust manifold that snapped in half), though a large majority of their poor reputation stems from experiences of various automotive forum members.
I have YET to see anyone even try to defend XS-power. Which brings to me to my next point. Besides their utter lack of QA, their "customer service" is down right amazing. Go read their feedback. See how well the seller communicates with the customers.
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