I'm not trying to dis anyone or ruffle any feathers, so don't take this personally. I just have to say that increasing exhaust backpressure does not increase low end torque. That's a falacy, myth, old wives tale, whatever you want to call it, that just won't die. An engine that's built and tuned right will always have more low end throttle response, as well as more torque everywhere in the powerband if the backpressure is zero. Exhaust backpressure effects torque adversely at all RPM levels, although the negative effects are greater and more obvious at high rpm. Adding collector length to open headers does often increase low end torque, but it's not because it adds backpressure. It just changes the resonance wave tuning so that it's correct at a lower RPM level. Likewise, the point at which the crossover is installed, especially on a large diameter exhaust system, often becomes the resonant point, and acts just like the end of a long collector. This principle can be used to build more low end torque, but adding backpressure just isn't what does it.On 2002-05-09 01:25, BuiltFordTough wrote:
Yeah, H pipe seems to make more backpressure, so, ++ on low-mid range torque, X pipe= less backpressure, which is more high end HP and less low-mid range torque, as for the sounds I have no idea.