Maxima Forums - View Single Post - Exhaust Information Thread: (With Sound Clips)

**phenryiv1** · 09-22-2005, 07:22 AM

This is the exhaust information thread. DO NOT POST QUESTIONS IN THIS THREAD.

You MAY post new sound clips, but I will merge them into the existing sound clip posts.

Information:

Can I put a 5th gen muffler on my 4th gen?

Yes, you can. But it yeilds no extra hp. 1 if you are lucky.

Help me out! Please reply to my thread....
Pull to the right, Pull to the left
92 bose amp to 98 max bose sysetm

Should I punch out (gut) the catalytic converter?

Don't do this. It is illegal. It is bad for the environment. It will gain you little improvement.

Wheel and tire combo?

Doesn't an engine need backpressure to make power?

Exhaust system backpressure is ALWAYS BAD! Engines do not need backpressure to make good torque. What an engine needs is a system that maintains high exhaust stream velocity at low RPM.

AWESOME info about different exhaust mods, including some installation information:
http://greghome.com/Greg's%20Gar...nce%20Mods.htm <---Cut and paste in browser- it is well worth it!

How to install an aftermarket Y-pipe in your garage

After installing, and removing and installing aftermarket y-pipes on 6 different maximas and doing it on my car 5 times (don't ask), I feel that I've got it down to a science.

This is what you'll need to do to make it as painless as possible:

1. take your car to a local muffler shop and have them remove and replace the two bolts that attach the stock y-pipe to the cat. (These bolts are typically rusted on BAD) This will cost about 15 bucks and it will save you A LOT of hassle later.

2. Get these tools:

* 3/8in drive socket wrench (prefferably a pretty big one)
* 14mm deep socket
* 12mm deep socket
* 10mm socket
* 22mm box set wrench or O2 sensor socket
* 12 inch 3/8 drive extension
* universal 3/8 drive swivel (for hard to get at rear bank bolts)
* jack stands or ramps
* LOTS of WD-40 or PB blaster
* good work light
* something padded to lay on while under the car (you'll be under there for a while)

3. Jack the car up (or drive onto ramps) and soak all 8 bolts and O2 sensors with WD-40 or PB blaster and let them soak for about 10 minutes (make sure car is pretty cool before you do this or the stuff will just burn off)

4. remove the 2 12mm bolts that hold the y-pipe to the engine block (they come off really easy)

5. loosen the 2 14mm cat bolts

6. loosen the 6 14mm y-pipe to manifold bolts (2 of the rear ones will require the swivel extension) These will requre a lot of elbow grease...don't be afraid to use a lot of force on them....you will NOT need an impact wrench. I've pulled all 6 of them off a max with 120K miles on it no problem.

7. loosen and remove the 2 o2 sensors on y-pipe. The front one will be REALLY hard to get to. You might have to disconnect the harness for the front 02 sensor located in the engine bay in front of the front valve cover (right behind the radiator) and give yourself some slack to work with so you can lower the y-pipe a bit before loosening and removing the front 02 sensor

8. Now everything should be loosened, you can remove all the bolts and slowly lower the stock y-pipe to the floor (be careful, this thing weights 25lbs and it's very ackward to balance while laying on your back.

9. There is a heat sheld that you will probably have to remove for clearance with the new pipe. I believe it has 2-3 10mm bolts holding it in place and it's near the drive axle.

10. The aftermarket y should go in the same way the stock one came out. It will be MUCH easier to bolt in becuase it's much less bulky. Make sure to use new crush ring gaskets and a new cat gasket. You can use anti-sieze on the bolts when you install the new pipe if you choose.

11. Tighten everything up, reattach the O2 harness, lower the car...and ENJOY your added POWER

Credit: BriGuyMax

More info: http://www.cardomain.com/ride/255278/3

Changing Upstream O2 sensors:

Necessary tools:

*3/8" drive ratchet
*16mm O2 sensor removal ratchet (rent it from Autozone for free)
*OEM upstream O2 sensor(s)
*Anti-seize
*PB Blaster (or WD40)
*Scissors

1. Put the front end of the car on ramps or jackstands
2. Spray the O2 sensors with PB blaster (or other lubricant) to make removal easier; wait ten minutes.
3. Using the O2 sensor ratchet attachment, loosen the current O2 sensors that are installed in the "Y" portion of the Y-pipe
4. Trace the sensor harness up to the engine bay and unplug it. One will be close to the cabin, to the left of the spark plugs; the other will be clipped by the radiator, towards the front of the car
5. Cut the plastic things holding the harness; there will be multiple ones
6. Completely unscrew the O2 sensors
7. Plug in the new sensors to the now-empty connectors that the old sensors were attached to
8. Dangle the sensor from the engine bay to the underbody of the car, taking care to do it SLOWLY so you don't damage the sensor
9. Put a little anti-seize on the threads of the sensors (if there isn’t any already)
10. Screw 'em in and you're done.

Changing Downstream O2 sensor:

Necessary tools:

*12mm wrench
*OEM downstream O2 sensor
*Anti-seize
*PB Blaster (or WD40)
*Scissors

1. Put the rear end of the car on ramps or jackstands
2. Locate the downstream O2 sensor; it is in rear-half the catalytic converter, on the driver’s side (middle of the car is where you should be looking)
3. Spray the sensor with PB Blaster or WD40
4. Trace the harness to the underbody of the car
5. Pull on the harness until the rubber seal pops free
6. Disconnect the old sensor from the harness
7. Apply anti-seize to the new O2 sensor (if it doesn’t already have some); take care not to get the compound on the sensor head
8. Screw in the sensor
9. Connect the new sensor to the harness
10. Jam the excess wiring back into the hole and close it up with the rubber seal
11. Using one of the supplied zip ties, secure any slack wiring.

__________________________________________________

Useful picture to post up for clarification purposes, it's not as messy as the FSM picture.

http://forums.maxima.org/members/tun...exhaust-2.html

Noting the OE size for the cat, piping, res, and muffler would be useful info for anyone considering custom work.

__________________________________________

You should really clean the mating surfaces when installing any exhaust system.

09-22-2005, 07:22 AM	#1
phenryiv1 Mod her. Ate her. 2008 Legacy 2.5i 5MT Join Date: May 2002 Location: Martinsburg, WV iTrader: (18) Posts: 9,487	This is the exhaust information thread. DO NOT POST QUESTIONS IN THIS THREAD. You MAY post new sound clips, but I will merge them into the existing sound clip posts. Information: Can I put a 5th gen muffler on my 4th gen? Yes, you can. But it yeilds no extra hp. 1 if you are lucky. Help me out! Please reply to my thread.... Pull to the right, Pull to the left 92 bose amp to 98 max bose sysetm Should I punch out (gut) the catalytic converter? Don't do this. It is illegal. It is bad for the environment. It will gain you little improvement. Wheel and tire combo? Doesn't an engine need backpressure to make power? Exhaust system backpressure is ALWAYS BAD! Engines do not need backpressure to make good torque. What an engine needs is a system that maintains high exhaust stream velocity at low RPM. AWESOME info about different exhaust mods, including some installation information: http://greghome.com/Greg's%20Gar...nce%20Mods.htm <---Cut and paste in browser- it is well worth it! How to install an aftermarket Y-pipe in your garage After installing, and removing and installing aftermarket y-pipes on 6 different maximas and doing it on my car 5 times (don't ask), I feel that I've got it down to a science. This is what you'll need to do to make it as painless as possible: 1. take your car to a local muffler shop and have them remove and replace the two bolts that attach the stock y-pipe to the cat. (These bolts are typically rusted on BAD) This will cost about 15 bucks and it will save you A LOT of hassle later. 2. Get these tools: * 3/8in drive socket wrench (prefferably a pretty big one) * 14mm deep socket * 12mm deep socket * 10mm socket * 22mm box set wrench or O2 sensor socket * 12 inch 3/8 drive extension * universal 3/8 drive swivel (for hard to get at rear bank bolts) * jack stands or ramps * LOTS of WD-40 or PB blaster * good work light * something padded to lay on while under the car (you'll be under there for a while) 3. Jack the car up (or drive onto ramps) and soak all 8 bolts and O2 sensors with WD-40 or PB blaster and let them soak for about 10 minutes (make sure car is pretty cool before you do this or the stuff will just burn off) 4. remove the 2 12mm bolts that hold the y-pipe to the engine block (they come off really easy) 5. loosen the 2 14mm cat bolts 6. loosen the 6 14mm y-pipe to manifold bolts (2 of the rear ones will require the swivel extension) These will requre a lot of elbow grease...don't be afraid to use a lot of force on them....you will NOT need an impact wrench. I've pulled all 6 of them off a max with 120K miles on it no problem. 7. loosen and remove the 2 o2 sensors on y-pipe. The front one will be REALLY hard to get to. You might have to disconnect the harness for the front 02 sensor located in the engine bay in front of the front valve cover (right behind the radiator) and give yourself some slack to work with so you can lower the y-pipe a bit before loosening and removing the front 02 sensor 8. Now everything should be loosened, you can remove all the bolts and slowly lower the stock y-pipe to the floor (be careful, this thing weights 25lbs and it's very ackward to balance while laying on your back. 9. There is a heat sheld that you will probably have to remove for clearance with the new pipe. I believe it has 2-3 10mm bolts holding it in place and it's near the drive axle. 10. The aftermarket y should go in the same way the stock one came out. It will be MUCH easier to bolt in becuase it's much less bulky. Make sure to use new crush ring gaskets and a new cat gasket. You can use anti-sieze on the bolts when you install the new pipe if you choose. 11. Tighten everything up, reattach the O2 harness, lower the car...and ENJOY your added POWER Credit: BriGuyMax More info: http://www.cardomain.com/ride/255278/3 Changing Upstream O2 sensors: Necessary tools: 3/8" drive ratchet 16mm O2 sensor removal ratchet (rent it from Autozone for free) OEM upstream O2 sensor(s) Anti-seize PB Blaster (or WD40) Scissors 1. Put the front end of the car on ramps or jackstands 2. Spray the O2 sensors with PB blaster (or other lubricant) to make removal easier; wait ten minutes. 3. Using the O2 sensor ratchet attachment, loosen the current O2 sensors that are installed in the "Y" portion of the Y-pipe 4. Trace the sensor harness up to the engine bay and unplug it. One will be close to the cabin, to the left of the spark plugs; the other will be clipped by the radiator, towards the front of the car 5. Cut the plastic things holding the harness; there will be multiple ones 6. Completely unscrew the O2 sensors 7. Plug in the new sensors to the now-empty connectors that the old sensors were attached to 8. Dangle the sensor from the engine bay to the underbody of the car, taking care to do it SLOWLY so you don't damage the sensor 9. Put a little anti-seize on the threads of the sensors (if there isn’t any already) 10. Screw 'em in and you're done. Changing Downstream O2 sensor: Necessary tools: 12mm wrench OEM downstream O2 sensor Anti-seize PB Blaster (or WD40) Scissors 1. Put the rear end of the car on ramps or jackstands 2. Locate the downstream O2 sensor; it is in rear-half the catalytic converter, on the driver’s side (middle of the car is where you should be looking) 3. Spray the sensor with PB Blaster or WD40 4. Trace the harness to the underbody of the car 5. Pull on the harness until the rubber seal pops free 6. Disconnect the old sensor from the harness 7. Apply anti-seize to the new O2 sensor (if it doesn’t already have some); take care not to get the compound on the sensor head 8. Screw in the sensor 9. Connect the new sensor to the harness 10. Jam the excess wiring back into the hole and close it up with the rubber seal 11. Using one of the supplied zip ties, secure any slack wiring. __________________________________________________ Useful picture to post up for clarification purposes, it's not as messy as the FSM picture. http://forums.maxima.org/members/tun...exhaust-2.html Noting the OE size for the cat, piping, res, and muffler would be useful info for anyone considering custom work. __________________________________________ You should really clean the mating surfaces when installing any exhaust system. Last edited by phenryiv1; 01-21-2009 at 08:01 PM.*