What exhaust

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It looks like a modified Gen1 front pipe kit, they work quite well.
 
Thats what I thought.

Im tempted to modify my own,add the rear crossover identical to the arrow full system.
I have a akrapovic 60mm thru thru silencer with a link pipe that goes from 50mm-->60mm.Id like to cut the oem link pipe att the collector and build it from there like the akrapovic 2-1 evo system.
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If you look at it,the evo system merges the two headers in to a similar diameter pipe that then expands to I think 65mm at the silencer.This creates a scavenging effect that increases hp.
The stock link pipe just connects the two headers in to a ~60mm tubing,all slipons are basically same diameter pipes,so there is no scavenging effect.
 

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