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In my experience with turbo air cooled VW and turbo ls builds is that until you get to the extremes of what horsepower a platform is capable of making that the turbo and engine just doesn't give a crap what shape the hot side is in within reason.
Imo after the turbo is where you can see some gains on street able setups. More open is better. There's no such thing as post turbo exhaust scavenging
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Too much junk to list. From a 10mpg caddy limo to a 5 speed Saturn
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