As far as direct injection is concerned,isn't the ficht injection on outboard motors a direct injection.Also would a direct injection with a variable exhaust that uses a O2 sensor in exhaust to adjust the exhaust as far as amount of unburn't fuel not being combusted.forgive the ignorance just...
?maxracer your right I was putting backpressure with sound waves.I learned on another forum about the differences in normally aspirated and turbocharged.turbo's want as big a exhaust leaving turbo as possible and straight thru exhaust where as normally asperiated street vehicles can use the...
while I only know enough to be dangerous.most exhaust use some type of scavenge effect where alittle back pressure helps torque.I believe flowmaster uses this type principle in there street systems.
