Normally, I too would consider headers to be a maintenance headache, between leaks, cracks in poor quality ones, etc. I assume these SD headers are made in China, for that price? What's the quality of them? If I'm going to gain, say, 7-8hp from a PLog, or 15-18hp from cheap headers, to be honest, I'd rather take less apart and do a Plog.

Although, admittedly, happiness with the performance of a PLog seems to vary based on my searches...