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Hi Guys, Did anybody experienced a Rumbling sound underneath their vehicle everytime you drive in the rain. I am not sure if it is the exhaust or something else. I have a Greddy Evo exhaust. Do you think it is the exhaust? It sounds like somebody is hammering on my floorboard. Need help! Expert Advice or opinion!

 
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i have the greddy evo 2 and that happened when it was a HEAVY rain, but I also had a leak in the welds too (I have an LX so we cut it and welded it in, didnt feel like waiting for an adapter) Are you sure everything is tight and there are no leaks?

 
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There is a heat shield between the muffler and floor board that is infamous for rattling and popping when it gets wet.

 
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my diagnosis

https://www.civicforums.com/forums/3...hen-rains.html

 
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yeah the rain makes the pipes expand and you get rattle to the car. even the stock exhaust has a lil fix for the b-pipe i think

 
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Well, I am pretty sure that the bolts are tight enough. It might be an exhaust leak also. But, I will check that Exhaust cover before I turn it in to the shop. Hopefully thats the culprit !!!

 
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Its the midpipe right underneath the floorboard on the passenger side, i have the greddy sp2 and it does the same thing lol. scared the **** outta me the first time it happened, now im used to it lol.

 
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Anyone have any updates on this issue? I replaced the cat and it did not fix the problem, then I replaced from the cat-back w/ Apexi WS2 and it still does the same friggin thing in the rain or though puddles. As soon as it dries out, it quiets back down.