Correct on the header issue. You could use 3" everything back. You just will loose some torque on the launch, but can gain some high end. But I would not be reving past 6500rpm anyway.
For me, mostly around town, I like the torque on the bottom. Quicker 0-60.
If you do put a header on now, you could always sell it here after you do the turbo swap.
Cat conv does give you some (?) back pressure for the n/a.
If it were me....I would go 3" with a 3 chamber magnaflow muffler to get some back pressure. It would be plenty of sound, and I've read of others with turbos use it just fine.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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