Ok this is the situation, not too long ago i got my b16, with the engine i was running before i had 2.25 inch pipe and recently switched to 2.5 inch. Just tonight (by the way, the first time it has rained since i got my exaust switched), my car started acting funny, while driving it normally it would just bog out for a sec or less and return to normal, it did this about three to four times. Luckily i reached my neghiborhood before it completley shut down. Tried to start it for awhile and it would start and just die out. Finally it cranked up and i got it to my house checked it to see if it was getting spark and it is, throttle cable is good, but when i looked under the car (being that its cold) i saw exhaust leaking from two of the welds, and water dripping out of both, i had left it running for about 20 min and there was a puddle the size of a dollar i'm thinking maybe it was just condensation leaking out of the bad welds but could this be why my car is acting funny, and do you think because of this my head might be warped??? It still runs and takes gas normaly but has a little backfire. Any suggestions, opinions, or general help would be appreciated...