- My model of MX-5 is: __2011 Sport Tech
- I’m based near: __Newcastle
After fitting some new suspension to the car and refitting refitting the parts i’d removed I had a good look at the sound tube thingy. I’ve always thought there was a weird noise which I didn’t like and presume this is partly responsible, So…I’ve removed the part that joins the resonator to the bulkhead,. It was a little tricky as there are two hard plastic tabs holding it together.
I’ve ordered the blanking plug for the hole in the bulkhead.
As you’ll see from the pictures the tube from the inlet manifold doesn’t vent into the cabin as many thnk, the resonator part is a sealed diaphragm that vibrates and therefor passes sound through the bulkhead. A bit like a speaker but instead of being driven by an electrical voice coil it’s movement is made by the intake pressure. If this wasn’t a sealed tube you’d have unmetered air getting into the engine.
Mine now simply makes its noise into the engine bay. I can’t see this being a problem.
Hope this is helpful.