|
No, and yes.
On my car the header helped a lot, and i don't have an exhaust. I think a full system (I/H/E) would free up the most hp, but the header still helps a lot without an exhaust.
As for with the turbo, yes, a small exhuast increases backpressure quite a bit. A bigger exhuast frees up a lot of horsepower on a car with either a turbo or a supercharger.
__________________
Justin McClanahan
95 G20
15.4 @ 91.4mph (2.4 60ft  )
143.7whp and 131.4 ft.lbs
Primera (10:1) Intake Cam, HS CAI, HS Header, UR Pullies, 19* Timing, ACT, Lightened Stock Flywheel, GC/AGX, Pacesetter Short Shifter, and more stuff...
|