Black Liquid in tha Exhaust Pipe

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Well i have a tanabe hyper catback on my 99 Si. My car has a scentless black liquid spitting out of the exhaust everytime i sit and rev tha engine. It almost resembles the consistency of water, but just black. Well in the past couple of days its has been raining in san jose and mah car was parked outside. Could it be the water got into the exhaust and my muffler became a container for water or is it the low quality gas that i had pumped? Thanx
 
water+carbon deposits = black, water-like substance!

BEST QUESTION THIS MONTH! :D
 
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