I noticed Jinkster recv'd the AKRA full exh, is it better than Brocks?
Which one fits better ?
Mark
Hmmmmm...is your question answered?
Good, empassioned debate gents. I like both systems. I've done insane amounts of exhaust research and hand-built and dyno'd many car and bike headers (I've since retired--I'd rather ride than work).
For what its worth, I've searched and searched for the "reputed" low-RPM torque loss with BDE and have never been able to prove its existence from dyno torque charts, roll-on's, nor seat-of-the-pants. When properly mapped, if it's there, it must be at VERY low RPM and VERY small. Brock says "no torque loss" and after dealing with him closely for almost two years, I found him to be a man of high integrity and technical competence. It is no small achievement to design a system that retains low-RPM power while adding peak power. That being said, theory indicates that there
could be a low-RPM torque loss that accompanies major
mid-to-high RPM gains. Such apparent inconsistencies between real world results and the arkane, black art of exhaust physics are common.
About 10 years ago, I managed to acquire the engineering formula for exhaust header design that a major U.S. auto corporation used for their engine development (don't ask) and happily set about the task of using the equations for my own exhaust designs. It was so full of convoluted variables that I could more easily have calculated the trajectory of a missle intercepting another missle in flight but, at least, I gained a strong sense of the theoretical considerations which are challenging to grasp in their entirety.
Regardless of exhaust preference, the weight loss with either system is excellent--
weight is the enemy! I've never actually used an Ak exhaust but I have polished several and I found the build quality and fabrication to be consistently outstanding. I even inserted a small, articulating mirror (similar to a dental mirror) into an Ak exhaust tube and looked at the *inside* weld quality. The welds looked great--no goobers nor over-penetration that cause flow turbulence. As an ex-pro welder, I was genuinely impressed. I did the same with a popular "Yos_" brand tube and nearly puked at the mess. That kind of manufacturing variance can make measurable differences in power output and Ak's got their fabrication RIGHT. At the high-end of Busa exhaust products, you actually get what you pay for. Upon close inspection, I have seen occasional cosmetic flaws with BDE but
never any structural flaws. Metal craftsmen tend to look more closely at build quality than the average rider-buyer and both BDE and Ak are well executed and proven in their respective genres--drag racing and road racing. Back to theory, the BDE should have an edge in peak power and the Ak should have an edge at mid-range power (note the
"should have").
I don't see how you could go wrong with either one and, as you know, the mapping is
as important as the hardware. My BDE'd Busa has been very well mapped and exhibits no throttle response anomalies at any load/RPM and THAT makes me very happy when I twist the throttle in any riding conditions.
Excuse my $.03 passionate rant. I just can't help myself. Happy trails...
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