Wouldn't work, for the reasons mentioned before.
I usually only deal with NA engines, but I want to add a couple of things to think about.
First, mass flow rate. The idea does not increase the mass flow rate through the engine (directly anyway, beyond a greater pressure differential during valve overlap, and possibly slightly better turbo performance, both of which would be tiny). The mass flow rate of the air going into the engine governs how much air (thus fuel) there is to combust, and so how much power you make. It's why we strap turbos and superchargers to our cars. Also, mass flow rate is a big factor in how much work your compressor does.
Two, backpressure. Backpressure is undesirable, but it is a result of something that is needed, which is exhaust velocity. Fast flow exhaust gases help scavenging and VE, and prevent things like reversion. It's the reason why cars don't just run 6" exhausts, or race engines with no exhaust at all.