Active exhaust = SILENCE on demand!

I love the sound of a high revving/boosting engine going WOT (wide open throttle). The exhaust note is part of the experience when driving a tuned car. It gives feedback to the driver and adds to the whole experience , especially a turbo car with all the added noise from waste gate, dump valve, compressor whine etc.
<div>If you don’t agree, your are simply not a man. </div><div>
</div><div>But i hate the loud booming resonating exhaust sound in the cabin during cruise at low/mid rpm.  My 3” on the turbo setup was “ok” on short trips but still too loud without ear plugs. Longer trips was a true pain.</div><div>My current N/A setup is a Simons 2.5 with a chambered back box and small middle muffler which is better but I still have a buzz in my head after longer trips without ear plugs.</div><div>
</div><div>For serious power 2.5” wont cut it.  I gained almost 400 rpm of spool going from 2.5” to 3” when running with the stock MSM turbo (~200whp).  Spool will not be a problem with a supercharger but after the header the same basic  principles apply for turbo,N/A and super:</div><div>
</div><div>“The best muffler is no muffler at all” </div><div>
</div><div>.. as these pictures clearly illustrates:</div><div class="separator" style="clear: both; text-align: center;"></div><div>
</div><div>    Nice ,but no thanks.</div><div>
</div><div>My solution will include more of this:</div><div class="separator" style="clear: both; text-align: center;"></div><div>
</div><div>and I will utilize the OEM MSM rear muffler with a custom 3” going from the header back.</div><div>
</div><div>Here is a pic of the underside of the MSM with the OEM exhaust. I have added ~ measurements in cm</div><div class="separator" style="clear: both; text-align: center;"></div><div>  </div><div>The section used for the CAT fits a 3” 60cm resonator/round muffler or a shorter resonator and a 100 cell CAT.</div><div>The OEM resonator section should have enough space for a 20-25 cm muffler.</div><div>The section marked green should be big enough for a custom cut out to the 2.25” oem muffler and a 3” pipe with the exhaust valve ending in a  resonated tip.</div><div>The stock actuator opens at 11 psi which isn’t optimal for a centrifugal blower with linear boost so if that doesn’t work out I’ll replace the actuator with cable operated mechanism with a lever.</div><div>
</div><div>Pros:</div><div>- Quiet cruise. </div><div>- High flowing/ low back pressure when WOT.</div><div>
</div><div>Cons:</div><div>- $$$ for parts and custom work</div><div>- Cutting a hole in the bumper for the second exhaust tip on the opposite side.</div><div>- Added weight.</div><div>


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