Quote:
Originally Posted by raywai2
How's AA+Sport compare to AA+Race in Sport/Sport+ mode under throttle?
Understandably these two combos are significantly different in volume when in Efficient mode (and during normal start up) when the valves are closed due to the less muffled Race muffler. But when the valves are open, the volume would not be much different (throwing in the AA+stock muffler in the mix as well) since the exhaust flow to the valves is straight through and the flow to the muffler is a diversion? IND has a video comparing their Eisenmann Valved Competition axleback to stock in Efficient, Sport, and Sport+. The volume difference in Sport/Sport+ is indistinguishable.
Curious to hear your real life experience comparing the two combos when the valves are opened.
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There is a noticeable difference as I mentioned above. Doesn't matter what engine mod you are in, Efficient vs Efficient and Sport+ vs Sport+ are both louder in the favor of Race. I know many think that valves open should be almost identical for Race and Sport but it is not. Race muffler consists of two pieces that look like scuba tanks and they are pretty much empty inside, zero sound insulation. When the valves are open, there is still exhaust flow going into the muffler therefore different mufflers will still produce different sound even when valves are open. So this one difference between the two. Another one is the two resonators that are on the Sport version (see above for pictures). Race system does not have those resonators so those resonators must make the difference actually when the valves are open. Long story short, these are my theories behind the sound difference between two systems. I would get nervous driving valves open (or even closed) with Race+AA because I would think it was too loud and would get me in trouble. Now I can comfortably cruise around the town valves open with Sport+AA system. This setup actually might be slightly louder than my M4 Comp with MPE; on the other hand, Race+AA was definitely a lot louder than my M4 with MPE. This is the best I can explain the difference between two systems. Hope it helps. Also, as I said before, some people might prefer the louder Race setup but it's just not for me.