Problem I've been having for awhile just recently put on test pipes and gota tune but ever since then whenever driving tthrough heavy rain the car starts acting up and running really bad. The code I got yesterday now is P2a00 and 03. Two weeks ago I had the rear 02 sensor max voltage and I removed it from the ECU. I do have the stillen gen 3 and never had that problem with it so I know it's not water getting in. Weird thing is it's only doing it when it rains heavy, when it's dry out run great and pulls hard... MAF voltage is consistent 1.2-1.3... I'm assuming some wiring has to be getting wet under the car related to the sensors but all look the same just like before I put on the test pipes. Fast Intention pipes if anyone is curious. Any help is welcome.