Rant: I was on d-series.org ALOT back in the day, even got me some H-T. The understanding was that two headers proved to be the best for the D-series engine, and some argue even the B series. Both Hytech and SMS-P offer custom designs and off-the-shelf. Last study I saw showed that the off-the-shelf Hytech would produce about 1whp more than the SMS-P on a D16a motor with simple I/H/ECU mods. Hytech went for about $1400, which is $700 more than the SMS-P. That was 2 years ago and I am sure other brands have joined the best of breed header market. DC was, perhaps still is, considered the best value. Yet, I don't see much of apple-to-apple comparsions these days, though I don't read tuner mags anymore.I have a custom built 4-1 SMS-P header currently. It was purchased used, the original owner had it coated by swain and designed it for a medium street d16a motor as it does have a 2" collector.
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