To reduce the slight body roll my wrx, replacing the rear sway bar with a white line heavy duty sway would this decrease it?

yes

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http://www.trapster.com - spot da haterz

As seen in quite a few threads.

OT - Where did all the other posts on this thread go ?????

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[COLOR=Black]Liberty GT Spec B tuned 240 HP & 372 Nm at the hubs.[/COLOR] "Instead of banning high performance cars - ban low performance drivers"

first two replies answered the question.

granted, it was a dopey question to ask.

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Long live the WRC

Yes did it today and most of its gone now

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-Steve-
MY02 Bugeye WRX - Panda Spec

another good idea would be to replace your shock absorbers if they are old or worn. If they are too soft then you will get excessive body roll, and the car will feel unstable.

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Version 6 STI

22mm front 24 mm rear, upgrade your endlinks whilst you're at it to HD whiteline ally ones, you might want to upgrade your rear mounts also to whiteline HD items

^ Or the much cheaper OEM strengthened ones from 04+ WRX/STi's. I can post part numbers if anyone wants them.