It seems to have cleared the air (literally) on my remaining annoyances. A little more tuning and I think I've got it. If you recall, after the 4" exhaust install I acquired a big lag and a lot of smoke. Tuning, timing and AFC spacers, even resetting the IP timing to stock didn't help much. I had this heavy haze at idle and a blow (not a puff) of black smoke on any acceleration. The haze is gone completely and only a puff at each gear taking off from a stop.
The HTT turbo sits further back by about 2 1/2" than the H1C, so you can imagine the fun. The down pipe took a major alteration but turned out for the better giving me more room next to the drive shaft. The oil drain tube is now an oil drain hose. And I will probably have to lengthen the tube to the intercooler.