I wouldn't even know what the ECU looks like or where to find it I'm a complete n00b when it comes to cars. I think I might have to convince Rod (mr zed x) to help me out.
...lol its behind the passengers kick panel. Just pull back the carpet under the glove box and there should be a wooden panel there.. remove that and wa-lah! you should be looking at the ecu...
For the targa tops, use silicone spray on all your rubber seals... Dynamat is freakin awesome too... Makes such a difference to the acoustics. Pull off any panel near the squeak and dynamat the back of it. Get a X pipe for your exhaust to quieten that drone down. Done!