Headers vs. Exhaust Manifolds ~ 'Let The Debate Begin'

~ Numbers, Lets See Those Numbers ~

1972 Plymouth 'Duster 340'

'Stock' Engine w/ Stock Exhaust System

Factory Ratings {Net Horsepower}
* 240 HP @ 4800 RPM's ................ 290 Ft./Lbs. @ 3600 RPM's

~ Gross Horsepower ~ ................. ~ Torque ~

> 196 HP @ 3000 RPM's ................ 325 Ft/Lbs. @ 3000 RPM's
> 245 HP @ 4000 RPM's ................ 327 Ft. Lbs. @ 4000 RPM's
> 273 HP @ 5000 RPM's ................ 292 Ft./Lbs, @ 5000 RPM's
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'Stock' Engine w/ Hooker Headers {Competition Series #5901}
* Primary Tubes ...... 1 5/8"
* Gauge ................. 16 {.065"}
* Tube Length ......... 34"
* Collector .............. 3" x 8"

With 'Open Headers'

> 221 HP @ 3000 RPM's ................. 348 Ft./Lbs. @ 3000 RPM's
> 279 HP @ 4000 RPM's ................. 343 Ft/Lbs. @ 4000 RPM's
> 295 HP @ 5000 RPM's ................. 309 Ft./Lbs. @ 5000 RPM's
> 297 HP @ 5200 RPM's ................. 298 Ft./Lbs. @ 5200 RPM's