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I would change the charge pipe anyways if you already have it. Why wait until it blows? What if it breaks when you’re a far distance from the house, or just at a bad time and place? Somehow when I had my 335 with the N54, the stock charge pipe never broke on me even when I was pushing about 450whp daily. On my X3 the charge pipe blew out on MHD Stage 1.
Be mindful of how much E85 you’re putting into the stock fuel system too. Rule of thumb with N54 and N55’s is that you don’t want to exceed a E40 mixture (really like E35-E40 is pushing it). The stock lpfp is good for 500whp but the HPFP is going to be the weak link.
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