You're welcome, John.
I'm not currently running them, but I purchased CB turbo hats, gaskets, and cone air filters. This gives a substantial decrease in noise. I also bought and used shorter velocity stacks as the CB turbo hats are about 1/2" shorter than the standard Weber air filters.
I did back-to-back tests but I don't remember actual numbers. It was at least 7-8 dB(I think more). Remember every 3 dB is 50% less perceived loudness, so 7-8 is quite a lot.
The only number I remember is 107dB at WOT with the top installed and up. I'm positive it was below 100 dB after the turbo hats but I don't have that info.
Ok, looked it up and the noise level was REDUCED TO 95dB from 107. That's HUGE.
https://www.speedsterowners.co...9#570173836977601739
I am not running this setup now. Big difference in noise level going from 44IDF(36mm vents) to 48mm throttle bodies. The bigger throat simply makes more noise. I may have to go back to it though, it's pretty loud. My ears are always ringing, but today they are ringing a little more after driving the Spyder yesterday.