My supercharger suddenly started sounding like a firetruck
 

I was cruising ~ 50mph yesterday on my way back from picking up some chinese food and I started to looking around because I thought I heard a firetruck somewhere. After turning the radio down and declutching, I realized it was coming from my car :( I bought a used old JSRC kit (sebring one) and have put a good 4-5k miles on it in past couple months. It never got louder until suddenly yesterday. It still makes boost, but its just makes terrible noises. It is intercoolered with 2 throttles and the pre supercharger throttle is still functioning properly.

Setup -
96 miata
Old jsrc kit (sebring) - I changed the oil when I installed
TDR tensioner and overlay pulley
1mm smaller nose pulley
air to air ic with two throttles
makes ~7.5-8psi
megasquirt

Has my sc bit the dust?

Check the bypass is operating properly.

Pull the belt and rotate the pulley by hand. You should not feel anything at all. May be a bearing(s) gone.

Had you ever checked the oil?

It is the bypass valve. It doesnt work anymore :( I guess the diaphragm in there finally gave up the ghost.

Are options for cheaper replacements other than mossmiata.com for $90?

Yes, TrackDogRacing.com at about 2/3rd the price.

I have a used one. 35.00 shipped
For a m45