2" for na is going to be about as larger as you're going to want to go up to the primary cat. You can go to 2.5 after the primary cat. Definitely either replace the secondary cats up by the exhaust manifolds with new cats or with "solid" resonators (you don't want ones with any packing that might shed and foul up the primary cat. This will prevent the cursed 3k resonance that shows up if you just eliminate the secondary cats. There are plenty of folks on the network who have installed various exhaust systems. Check out SVXFiles locker for the dozen or so he's done 
-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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