Anyone run HPD's 416 kit?
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Anyone run HPD's 416 kit?
Most of us who have the older HPD race mod kit have had great luck with it. The Power Maxx kit employs a variable exhaust valve, and requires a specially matched pipe...hence, quite a bit to change everything over. If you're considering race modding the 400 and you're starting from scratch the 416 kit would be the best way to go. It really rips.