Quote:
Originally Posted by
waynovetten
Fitted the Metalmule and it looked great and the bike looked 100lbs lighter,from the moment I started the bike up I realised it was a whole new ball game,went and test rode the bike and it was like riding a totally different animal,it had gone from a bike that pulls second gear from the lights without a second of hesitation to a real old fashioned thumper.
Without putting too finer point on it I was horrified,I'm lucky in the fact I don't pay for fuel maps or dyno time and maybe with some fettling it may have come better but it wasn't where I wanted to go,within an hour the Akra's were back on and I blasted around the block and I was relieved.
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The problem with 2-1 systems (like the Metal Mule) on the R/X is less to do with the fact they are 2-1, but more because they ALL have unequal length headers. Primary pipe or header length has a similar effect on exhaust gas velocity and flow as diameter does. The longer the header the faster the gases flow. The exhaust valve on the short header will scavenge better at high rpm as it has slower EGV than the longer one which will have increased EGV and therefore work better at low rpm. This discrepancy between the two primary pipes, and the fact that they are fighting against each other, will not help the engine to work at it's optimum efficiency.
2-1 pipes appear to work well on the Tenere and produce good torque and hp across the rev range because they use the stock equal length headers and collector.