Upper WHP limit for a 2.4" exhaust?

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2002.5 Mazda Protege ES
I'm planning on going turbo with a built motor -- shooting for about 350 whp -- and would like to hear from folks who've done this.

What size exhaust are you running? What kind of problems would I run into running a 2.4" cat-back exhaust on a built engine running enough boost to produce 350 whp?

What's the practical limit - in terms of whp - on a turbo'd engine for a 2.4" exhaust? 250 whp? 300 whp?

Would like to hear from folks who've actually built their motor and are running high levels of boost.
 
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