Me replacing the computer

Replace transmission pan gasket

Assuming you're talking about the lower oil pan...it's very simple

1. Lift at least the passenger front side of the car using a jack, jack-stand, and blocks on the rear wheels

2. Drain the oil out of the pan by removing the drain plug (just like an oil change)

3. Remove all of the bolts on the outside edge of the oil pan (should be about 11)

4. After all of the bolts have been removed the oil pan is free to come off. It might still be stuck on and a few gentle taps with a rubber mallet with knock it loose. Be aware that there is still some oil inside the pan, so this step will be pretty messy

5. Clean the surface of the engine where the oil pan was mounted against

6. Take your new oil pan and place the gasket around the rim of the pan (if not using a gasket then put liquid gasket around the rim. This is important to ensure the pan doesn't leak)

7. Place the oil pan on the engine and bolt it back on. Start by tightening on bolt, then one as close to 180 degrees across from it. Repeat until all the bolts are tightened.

8. Fill the oil pan with new oil. You may also wish to remove and replace the oil filter.

9. If you used liquid gasket, give it a few hours to set (look at contained for a recommend amount of time to wait). If you used a rubber gasket, you don't need to wait.

10. Start the engine and check for leaks. If you notice any oil leaking from around the seal then turn the engine off, go back to step 2 and then repeat from there on. If you don't see any leaks, you are good to go.

Sounds like your new muffler should come with the extra pipe already on it to get you to the connection you speak of,if the replacement muffler does not come with the pipe then you will need to buy that pipe also

get wiring diag.,check,this first,entire system,then,go from there.the ignition system!!!!!!!!!!!,keep it simple

i'm guessing you're asking because it's a v6 FWD and you don't know how to get to the spark plugs along the firewall. you will need to find the front motor mounts or the anti torque bolts whatever you wanna call it and make your motor swing. you can do that by locating your front motor mounts or side or even rear. i'm not sure with a eclipse but once you've found the anti torque bolts attached to it and removed them you can roll the car forward and it should leave about 6 inches of space behind the engine to get the those spark plugs. front should be easy

Positive battery cable.

before i start to explain how to replace this i cant stress this enough MAKE SURE THAT IS THE RIGHT COMPUTER FOR THAT ECLIPSE. the 95 non turbo eclipse has a different computer from the 96 to 99. and the gst and the gsx computers are different from eachother. the gst and the gsx computers are also different from the 95 and the 96-99 non turbo eclipses. when you get the computer i would bring your vin number to any local parts store or the dealer and they should know what to do with it. now that that is said. which computer do you need replaced. if your talking about the one inside the car it is located under the center console right behind the e-brake. removing that can be a challenge due to the several bolts that holds it on. you can use a phillips head screw driver but i wouldnt recommend it. i believe it is a 10mm socket that they will fix. after you get that off i would disconnect your battery. wait a few minutes than ground yourself out to the bracket holding the shift bar on(just grab ahold of it) after that is said and done there should be 4 bolts holding it on. (i believe 10mm cant remember) and a clip with several wires going to it. before installing. clean up the area around where the computer sat. remove any dirt or anything that may be there. check the clip that plugs into it for any damage, broken or burn wires, or if the plastic clip in itself is damaged. if not the dealer would be the only place to replace this at and i would strongly recommend a garage putting it in. if all is good installation is the opposite of removal. after you get everything together turn the car to the on possition with out starting the motor and let it sit for about 10 min. this will allow that computer to learn the way your car is set up. after that you should be able to start the motor with out a problem.
if you want the computer under the hood than its simple disconnect 1 or 2 clips and 3 to 4 bolts holding it on. inspect everything before installing the new computer along with cleaning up and dirt or rust in the area. and do the same process i explained about the other computer

should be in the bottom end of the exhaust manifold or the actual exhaust pipe befoe the cat ,

just remove all the bolts and hoses atached to the upper intake or go to the autoparts and buy a book for this specific car