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I thought I read that some wouldn't work W/ the 90mm TB. I'd like to see a pic of anyone's solution. I'd never heard of the fernco mod.
FERNCO is the name of a company that supplies rubber couplings for home plumbing fixtures.
In a closed engine compartment, the thin rubber will deteriorate, just like rubber hoses, belts or anything else.
Yes, they're cheaper than silicone, but you might find yourself with cracking rubber connections in your intake that contribute to poor performance.
This was an old modification in '94-95-96 Impala SS LT1/LT4 motors. Many owners discovered that saving a few dollars cost them more later.
I used the SLP bump bellows on my car as well. It's the perfect size at both ends and still have the flexibility that the oem accordion bellows offered.
In the end, it's your car to do with as you please...
Call or email them. They might just whack you off a longer version- at an additional cost of course. I did this at a different site a couple of years ago.