2003 Chrysler Town and Country Exhaust does it make a difference if the muffler is first and then the resonator last? that is what Midas did to my van and its louder now with the new exhaust

Starting from the front, coming off the exhaust manifold should have, 1. Exhaust pipe, 2. Catalytic converter, 3. Exhaust pipe, 4. Resonator, 5. Tail pipe. Also, there should be an Oxygen sensor somewhere around the catalytic converter.

water from the exhaust - muffler ?

Visit Midas. or purchase/ borrow the service manual for the vehicle and teach yourself how to replace brake components and test system after completing replacement of pad or shoes. If you have done it before then the method is the same.

1684= BATTERY DISCONNECTED WITHIN LAST 50 MILES.
1698 PCM FAILURE EEPROM WRITE DENIED ALSO
1698 NO CCD MESSAGES FROM TCM/ OR BCM

possible bad injector - recomend have injector checked and or do compression test on cylinder # 2

white smoke signifies water so its a head gasket without a doubt so you have two choices either trade it in quick or have it repaired but you could ask a local mechanic to give it a quick look in case the white smoke is blue in which case its oil

Possible results are , increased fuel use, reduction in power and you may fail noise emissions (too much noise), some after market exhaust systems are designed to give improvements but these are general much more costly than standard fittings. I would not be happy myself and would want it put right, Not sure which country you are in so can't advise on trading standards, but in uk items must be fit for purpose or you get your money back.

Find the exhaust pipe under the rear bumper. Follow its progress towards the front of the car. The first big bulbous thing you will find is the muffler, keep going. The next bulbous thing you may find is a resonator, keep going. Eventually you will come to a little thingy screwed into the side of the exhaust pipe which has some wires coming from it. That is your downstream O2 sensor. Next will be the catalytic converter, next thing will be the upstream O2 sensor, then the exhaust manifold, the the head of the engine.

It should be located near the outlet in the rear exhaust manifold, ahead of the converter. The downstream sensor 2 is the one located behind the converter or sometimes in the rear of the converter body.

check antenna connection at rear of radio and window antenna for damage or breaks