BREAKING: new 4 in 4 exhaust

[PowerDubs_imp]

Boosted (super or turbo charged) engines can make do without scavenging because there is intentional valve overlap and the boosted incoming charge literally blows the spent gases out. This is also why WW2 fighters have short, straight pipes. On our bikes (inline 4) a 4 into one header provides the best scavenging.

If the 4into1 system is more efficient , how come dragsters just have straight out pipes ?

Glad you said ‘can make do’- because although turbos can make up for poor engine designs and tuning- proper builds will still work better.

I’ve met waay too many guys that slap on turbos and think the answer is more boost. They ignore the fundamentals of engine / air pump reality- make the engine more efficient.

Doesn’t matter if that is intake design, bigger cams, properly designed exhaust- the better the package breathes, the more power the car will make, on the same turbo, on the same boost setting. Pulse tuning still applies in and out; cams still matter, both duration/lift and timing, valve sizes, etc.

But most just turn the boost knob and ignore things that require time, thought, and money.


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