Honda has proven tremendous reliability, competitive performance, and great fuel economy with their line of engines, VTEC or not. Why would they even entertain the thought of turbos? They're getting 240 hp out of the J30 and GM has yet to get that on the 3800 without forced induction. As the eminent venerable motors from those two companies, Honda is no doubt committed to naturally aspirited engines with VTEC. There's no reason to believe they'd consider turbos.