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Harvey,
On the serious side, have you had the time to calculate how the temperature of the intake charge and exhaust charge influence the effective length of the "pipe"? I've kept the location of the secondary cat constant (i.e. in it's stock location) and have replaced both primary cats with 1 5/8 OD pipe that connect to a preformed Y feeding into the secondary cat. While I haven't had time to isolate the exact source of the vibration I'm getting right around 3,000 rpms, I think it might be resonance in the exhaust system.
-Bill
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Retired NASA Rocket Scientist
Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023
Center Network Member #989
'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
My Locker
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