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Im getting a turbo, and im wondering if my engine will be fine to drive on to drive wit a 3" exhaust to get my turbo installed.. or should i get exhaust after i get turbo installed?

 
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I would get the exhaust afterwards. However I wouldn't do a 3" pipe. 2.25 is what I've seen most turbo civics running and it's just right. If you want bigger though the biggest I would go with is 2.5" piping just for suspension clearance issues.

 
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definitely wait until you get your turbo before getting 3" piping. You'll lose all your backpressure if you do it beforehand. Even 2.5" (which is what I have) feels like it's too much

 
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Actually 2.5 is a good piping size. Depends on how much you are boosting. remember 2.5 Mandrel bent pipes = 3 inch crush bent pipes. Also 3 inch exhaust are loud and really annoying on a daily driver, I had it for a while on my Turbo hatch.

 
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i can tell you that 3" is next to IMPOSSIBLE on our cars unless you are only l;owered about 1"... i have 2.5" piping.. then again im dropped about 3-31/2 inches on 19s.. but i scrape once in a while... if i put stock size stires on, then i scrape all over the place... 2.5" is good.. LOL.. cat has 2.25" and he and i have fastest turbo cars.. so far (SLIPS)

 
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most people run a 2.5 inch on turbo civics, and if anything they flare to a 3 inch.

 
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wat about 2.5" mandrel bent? before or after?