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Message: <blockquote data-quote="endless551" data-source="post: 555363" data-attributes="member: 4650"><p><strong>boxer rumble</strong></p><p></p><p>The distinctive rumble sound from a boxer is not only generated by the unequal length header pipes. It is also amplified by the firing order of a boxer angine, where for instance, both piston on one side of the engine move in phase (ie. up and down) with one another, this generate exhaust pulses of the same phase at one side of the engine whereas the opposite moves in opposite direction in relation to formal. </p><p></p><p></p><p></p><p>1 [||---|</p><p>|---||] 2</p><p>|---||] 3</p><p>4 [||---| </p><p></p><p>Ok, this should b clearer, piston 1&4 generates exhaust pulse of the same intensity (peak & trough) which is in opposite phase with pistons 2&3 as the non tune length exhaust header meets at the joint connecting to the turbine housing. Pulses collapse at the point whic are off phase (note 2 sets of pulses in an ideal situation) hence u hear the classical boxer note. Though it may sound good but this is actually a pitfall of boxer exhaust system, since when off phase exhaust pulses meet flow turbulence will form. Which in turns increases static pressure, also some effect on rotating effect of the turbine. Tune length header will be more space consuming and capital intensive hence was not adopted by earlier model WRX except MY03 above if I'm not wrong... </p><p></p><p>Hope this clear the air up a little.. might've made some mistakes or being unclear with my explaination.. Its late..</p></blockquote><p></p>

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