Quote:
Originally Posted by wparsons
That's just not true for all headers... where they make power depends on the design, just look at the nameless headers that make the bulk of their power increase in the midrange. Yes there are gains up top as well, but they're primarily designed for usable power in the midrange, not a couple extra hp at the very top of the RPM range.
Typically 4-1 headers shift power higher into the RPM range while 4-2-1 give a big bump in the middle, but that's not even always true until you compare if they're stepped or not, what diameter tubes and what length the tubes are.
Also, if you look at dynos pre/post manifold spacers, you'll see that you aren't really losing much power up top, it just seems that way because of the big bump they give around 6500 rpm. Forget about peak numbers, area under the curve is what makes the car faster.
|
Ok your choice in headers for what you would like. ButI look at other people's dyno graphs with similar mods. Don't tell me I didn't lose that much power when there is close to a 20whp difference after 6500rpm. I know Canadian fuel is garbage but from what i have seen our fuel is not giving that same drop as other people around here with similar mods except the spacers. Guess the only way to know for sure will be a dyno graph after I remove them.