I ran a fairly unrestrictive full 3" system that was 97Db and droney at highway speeds.... (ear bleedingly loud at 8300/30psi WoT pulls)
I built my Twin system that's 88Db that shifted the power curve/spool 1000 rpm earlier on the dyno and made around the 20 rwhp more on the top end and is...
15+ years old the Bonded rear section lets go and allows the inner to rotate so the Uni joints are out of phase and this helps hammer the centre bearing into submission.
Hillary Clinton and her driver were cruising along a country road one evening when an ancient cow loomed in front of the car. The driver tried to avoid it but couldn't - the aged bovine was struck and killed.
Hillary told her driver to go up to the farmhouse and explain to the owners what had...
The pully will thrash the bearings not the rings.
at 100psi low I'd be thinking mechanical damage as with a single bent valve I was dropping 15 psi.
My "guess" collapsed ring lands.
Crisp: If they're Stopper's they'll be 4 layer instead of 3.
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Update!
Just got done cleaning the Viton off my New Stopper (13km's old)
Seems that the Viton will set up harder in use this new one I gave it a quick soak in paint thinner and the Viton scrubbed right off...
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