I don't believe that for a second. If you use a small enough turbo or hotside, the V8 can provide enough exhaust gases to get peak boost almost where ever you want it. You most commonly see huge lag when dealing with turbo(s) and hotside(s) that are bigger than the car needs (hotmustang no offense) or when your reaching for 550+ numbers that require larger housings to get the required psi levels. I've seen a PI'd 97 with a 60mm and a small hotside see virtually instant boost - but i thought this was a downside not an upside. And I've driven a 68mm T3 5.0 that saw its peak boost at 2900rpms and kept it to redline. Turbo set ups are WAY more customizable than centri's or positive displacement blowers, plus more efficient and generally less strain on parts.