Losing torque with exhaust?

[Brainless]

A friend told me I can lose torque with some aftermarket exhaust. Can somebody explain that to me.<P>------------------<BR>Brainless<BR>93 Red RS<BR><A HREF="http://www.Geocities.com/j_micho" TARGET=_blank>geocities.com/j_micho</A> (last update 30/07/2001)

[David Coleman]

Backpressure in an exhaust is good, as it bolsters low end torque. It becomes a restriction at high rpm however, so that some larger diameter/freer flowing exhaust systems will make more high rpm power, but lose low end output. It is a balance. Also, velocity is reduced with larger diameter piping, which also reduces output. <P>------------------<BR>David Coleman- <B><I>Moderator</B></I><BR><A HREF="http://www.PinkMX-3.com" TARGET=_blank>1993 Mazda MX-3 GS Special Edition</A><BR><B><A HREF="http://www.highlandsun.com/hyc/sae920677/" TARGET=_blank><I>V6 engine info</I></A> | <A HREF="http://www.bradbury.cwc.net/probemx/index.htm" TARGET=_blank>KL FAQ</A> | <I><A HREF="http://www.brownsword.ca/Probe.html" TARGET=_blank>ECU reprogramming</A></I> | <A HREF="http://members.home.net/tekguy/" TARGET=_blank>K series Image cache</A> | <I><A HREF="http://archive.probetalk.com/cgi-bin/se ... tion=intro" TARGET=_blank>Probetalk Archive Search</A></I></B>