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      09-10-2012, 05:15 PM   #1
Nate@IND
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Eisenmann Sport Performance F10 M5 Oval tip (DIY)

The factory exhaust system found on the F10 M5 is a very well designed piece, with one continuous length of piping from the down pipes to the exhaust tips, generous piping diameters, and a nearly straight through muffler design. Unfortunately the original exhaust system does not produce a sound quite as sporting as many fans of the M5 would like, and the original exhaust tips also leave something to be desired. Many M5 owners are interested in the extra sound and larger tips of a performance exhaust system, but do not wish to add a complete exhaust system to the car, and this DIY installation guide of an Eisenmann rear muffler addresses just that.





Youíll need to lift the rear of the car, either by putting the car on a lift or placing the car securely on jackstands.





This shot shows the section of piping where a cut will be made to allow the Eisenmann rear mufflers to be installed.



Line up the Eisenmann rear muffler directly below the original BMW system. The key is to align the Eisenmann hangers so that they are immediately below the BMW exhaust hangers.



The Eisenmann exhaust piping contains an expanded section that is designed to slip over the original BMW piping. Use a straight edge to align the beginning of the expanded section with the original piping, and place a mark on the original piping. The goal here is to ensure there is a sufficient length of original BMW piping to slip inside the Eisenmann piping. Remember to measure twice and check your measurements as this step is important!



At this point you can use some masking tape to mark a complete line.



Use a pipe cutting tool to cut the connecting pipe



The mufflers are removed by unbolting the exhaust hangers. We will have some more detailed photos of the hanger locations early next week.



The system we installed on this car used Eisenmannís Oval exhaust tips, and a rear diffuser is provided to accommodate the larger tips. Prior to installing the Eisenmann system the original BMW diffuser must be removed. This is accomplished by first removing the black plastic rivets by using either a panel puller or a flat head screwdriver.









Once the plastic rivets have been removed, you can pull the diffuser off of the rear bumper, one clip at a time. Move along the diffuser, and it will release from the rear bumper.



The wiring in the photo above should be unclipped from itís plastic retainer, and slid directly behind the diffuser. This moves the wiring away from the exhaust tips.



At this point you can transfer the exhaust hangers from your original BMW muffler to the Eisenmann muffler. Raise the Eisenmann muffler slide the provided clamp over the OE BMW piping, and slide the Eisenmann piping over the BMW piping at this point. Raise the hangers to their original positions, and screw the original nuts back into place one by one. Tighten the clamp, but leave all of the nuts somewhat loose at this point, to allow for adjustment of the muffler tips.



Installation of the modified diffuser is reverse of removal. The modified diffuser is a trimmed OEM BMW piece, so it will fit exactly like factory. Simply snap the clips into the bumper one at a time, and re-install the plastic rivets.







AW vs. Gloss black diffuser-




The tip position can be adjusted by sliding the Eisenmann muffler forward and back on the original BMW piping, and also twisting it axially on the same piping. This will adjust the distance that the tips are exposed as well as the level and angle of the tips.

Once the tips are evenly positioned and angled relative to the rear diffuser, you can tighten the clamps and exhaust hanger nuts.

Youíre done! Enjoy the sound of your new exhaust!

Please keep in mind that this installation procedure applies to the oval tip slip on system only. The round tip exhaust systems do not require a different diffuser, and the full systems are completely bolt on and do not require cutting of your original exhaust.



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      09-19-2012, 11:26 AM   #2
Rich@GTBPerformance
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Great write up Nate

Can't wait to hear the system in person!
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      09-30-2012, 09:03 AM   #3
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So this actually requires cutting the pipes? What do you do when you revert to stock?
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      11-03-2012, 02:19 PM   #4
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Great write up and the oval exhaust looks great. I loved it ever since I saw it previously on the E60 body M5.
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      01-10-2013, 06:54 PM   #5
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Yuck cutting...
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      01-10-2013, 06:57 PM   #6
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Quote:
Originally Posted by Timberwolf View Post
Yuck cutting...
If you order the center pipes there is no cutting.

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      01-13-2013, 09:38 AM   #7
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Nate, has anyone done a dyno yet with just this setup (axle back only)? I know this is mostly just for sound, but still curious.

Ryan
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      04-11-2013, 12:48 AM   #8
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Quote:
Originally Posted by Nate@IND View Post
The factory exhaust system found on the F10 M5 is a very well designed piece, with one continuous length of piping from the down pipes to the exhaust tips, generous piping diameters, and a nearly straight through muffler design. Unfortunately the original exhaust system does not produce a sound quite as sporting as many fans of the M5 would like, and the original exhaust tips also leave something to be desired. Many M5 owners are interested in the extra sound and larger tips of a performance exhaust system, but do not wish to add a complete exhaust system to the car, and this DIY installation guide of an Eisenmann rear muffler addresses just that.





Youíll need to lift the rear of the car, either by putting the car on a lift or placing the car securely on jackstands.





This shot shows the section of piping where a cut will be made to allow the Eisenmann rear mufflers to be installed.



Line up the Eisenmann rear muffler directly below the original BMW system. The key is to align the Eisenmann hangers so that they are immediately below the BMW exhaust hangers.



The Eisenmann exhaust piping contains an expanded section that is designed to slip over the original BMW piping. Use a straight edge to align the beginning of the expanded section with the original piping, and place a mark on the original piping. The goal here is to ensure there is a sufficient length of original BMW piping to slip inside the Eisenmann piping. Remember to measure twice and check your measurements as this step is important!



At this point you can use some masking tape to mark a complete line.



Use a pipe cutting tool to cut the connecting pipe



The mufflers are removed by unbolting the exhaust hangers. We will have some more detailed photos of the hanger locations early next week.



The system we installed on this car used Eisenmannís Oval exhaust tips, and a rear diffuser is provided to accommodate the larger tips. Prior to installing the Eisenmann system the original BMW diffuser must be removed. This is accomplished by first removing the black plastic rivets by using either a panel puller or a flat head screwdriver.









Once the plastic rivets have been removed, you can pull the diffuser off of the rear bumper, one clip at a time. Move along the diffuser, and it will release from the rear bumper.



The wiring in the photo above should be unclipped from itís plastic retainer, and slid directly behind the diffuser. This moves the wiring away from the exhaust tips.



At this point you can transfer the exhaust hangers from your original BMW muffler to the Eisenmann muffler. Raise the Eisenmann muffler slide the provided clamp over the OE BMW piping, and slide the Eisenmann piping over the BMW piping at this point. Raise the hangers to their original positions, and screw the original nuts back into place one by one. Tighten the clamp, but leave all of the nuts somewhat loose at this point, to allow for adjustment of the muffler tips.



Installation of the modified diffuser is reverse of removal. The modified diffuser is a trimmed OEM BMW piece, so it will fit exactly like factory. Simply snap the clips into the bumper one at a time, and re-install the plastic rivets.







AW vs. Gloss black diffuser-




The tip position can be adjusted by sliding the Eisenmann muffler forward and back on the original BMW piping, and also twisting it axially on the same piping. This will adjust the distance that the tips are exposed as well as the level and angle of the tips.

Once the tips are evenly positioned and angled relative to the rear diffuser, you can tighten the clamps and exhaust hanger nuts.

Youíre done! Enjoy the sound of your new exhaust!

Please keep in mind that this installation procedure applies to the oval tip slip on system only. The round tip exhaust systems do not require a different diffuser, and the full systems are completely bolt on and do not require cutting of your original exhaust.



How much for the Eisenmann rear muffler with round tips. Thanks
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      03-30-2014, 11:43 PM   #9
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