Tailpipe question

Im lookin to buy some weld in exhuast tips, and I was wondering what length you reccomend. I know if you cut too much its bad for the exhaust and if the tip is too short you will see from the side of the car where they are welded in. Whats the best length for our cars. Right now Im looking at 18 and 22 inch tailpipes. What should I go with? Thanks
 
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