CL65 Carbon Fiber Rear Diffuser
The Best of Mercedes & AMG
Just got it off, now cleaning up the adhesive..
Any second thoughts, recommendation on the two bolt holes to be made?
Just got it off, now cleaning up the adhesive..
Any second thoughts, recommendation on the two bolt holes to be made?
for the left side, find where the plastic rivet hole is, drill left of it to start, for the right, drill right of where the right rivet hole is. Follow instructions provided in marking where the hole should be, just keep an eye that the mark is as I said, left, left of existing plastic rivet hole, and right, of right existing plastic rivet hole.
Back to work..
Hopefully my enlongated hole won't effect the fitting. Almost fits, the holes are a b*tch. Maybe getting the washers and bolt in will be just as hard.
for the left side, find where the plastic rivet hole is, drill left of it to start, for the right, drill right of where the right rivet hole is. Follow instructions provided in marking where the hole should be, just keep an eye that the mark is as I said, left, left of existing plastic rivet hole, and right, of right existing plastic rivet hole.
Back to work..
Hopefully my enlongated hole won't effect the fitting. Almost fits, the holes are a b*tch. Maybe getting the washers and bolt in will be just as hard.
1. Things you will need first, socket set, stanley knife, drill and drill bit, clean old cloths, rubbing alcohol, maker pen, 6 cans of cold beer of your choice, someone to help you (3 cans of beer are for them).
2. Raise car height to highest setting.
3. Undo the 2 bolts that hold up each exhaust as suggested by Sunpointer.
4. Use the stanley knife to cut the plastic rivets that are located on the stock black piece around where the exhaust pipes are. Some mention screws, mine were plastic.
5. Its now time to open can of beer, have a drink or 2.
6. Now cut the plastic rivets on the other side.
7. This is thirsty work so better keep hydrated and have another drink.
8. For clarity, the piece to be removed is the unpainted part on the rear bumper.
9. Lift up one corner and rip it off. It may come off in a small piece or a large piece. Doesn't matter how it comes off just keep peeling, when you get to about half way, time for another drink or 3, this part of the removal process makes for very thirsty work.
10. After re-hydrating continue peeling until you get to the end.
11. If not finished, finish that can off now.
12. Double check all the plastic has been removed.
13. Now rub the area down with the cloths and rubbing alcohol.
14. Now sit back and open that second can of beer.
15. Unwrap the diffuser. Jiggle the bolts gently to see if they are loose. If they don't come off you will need to drill a hole on either end of the bumper.
16. Line the diffuser up and get an idea how it will fit. You also will get an idea how your car will now look.
17. You see that the car already starts to look good now and you get excited. Your mate also tells you how good it looks. Time for another drink.
18. Line the diffuser up again. Mark where the bolts touch the bumper. One of you does the marking.
17. Before you drill any holes put your hand behind where you intend to drill to make sure there is no metal plate there. If all OK then start drilling.
18. After one side is done, it is time for another drink.
19. After your drink drill the hole on the other side.
20. Now line up the diffuser and hopefully you drilled the holes in the right spot and they are large enough for the bolts to go through.
21. If the holes are too small or they don't line up put the diffuser down gently take 5 steps back, say Oh Sh***t in unison with your mate, finish your beer off it will make things better.
22. After beer is finished drill larger hole as required, line up diffuser and see now it just fits right and holes you drilled cannot be seen.
23. You now say to your mate that your f***ing brillliant, this is going to look fantastic.
24. Give a final rub of rubbing alcohol to make sure all residue of old glue is off.
25. Sit back and open next can of beer, and have a drink.
26. Now line up the diffuser again, all looks good, now remove the backing tape on the diffuser's double sided tape.
27. Line the diffuser up and gently tighten the nut on each bolt as your diffuser gets closer to the bumper when it is close you both then push the diffuser up so that the double sided tape makes contact with the bumper. Keep the pressure on for a few minutes.
28. Tighten bolts but do not overtighten.
29. Sit back job is done, admire Neal's creation, admire your installation with your mate and finish the beer off.
30. Tidy up, start engine drop ride height back to normal level take car out of garage. Switch engine off, get out of car walk around and admire that rear end.
31. Time for photos. After photos taken, download to computer. Log on to mbworld and post them up.
I hope this helps those that haven't installed their diffuser yet.
I will post my pics as soon as I can.
1. Things you will need first, socket set, stanley knife, drill and drill bit, clean old cloths, rubbing alcohol, maker pen, 6 cans of cold beer of your choice, someone to help you (3 cans of beer are for them).
2. Raise car height to highest setting.
3. Undo the 2 bolts that hold up each exhaust as suggested by Sunpointer.
4. Use the stanley knife to cut the plastic rivets that are located on the stock black piece around where the exhaust pipes are. Some mention screws, mine were plastic.
5. Its now time to open can of beer, have a drink or 2.
6. Now cut the plastic rivets on the other side.
7. This is thirsty work so better keep hydrated and have another drink.
8. For clarity, the piece to be removed is the unpainted part on the rear bumper.
9. Lift up one corner and rip it off. It may come off in a small piece or a large piece. Doesn't matter how it comes off just keep peeling, when you get to about half way, time for another drink or 3, this part of the removal process makes for very thirsty work.
10. After re-hydrating continue peeling until you get to the end.
11. If not finished, finish that can off now.
12. Double check all the plastic has been removed.
13. Now rub the area down with the cloths and rubbing alcohol.
14. Now sit back and open that second can of beer.
15. Unwrap the diffuser. Jiggle the bolts gently to see if they are loose. If they don't come off you will need to drill a hole on either end of the bumper.
16. Line the diffuser up and get an idea how it will fit. You also will get an idea how your car will now look.
17. You see that the car already starts to look good now and you get excited. Your mate also tells you how good it looks. Time for another drink.
18. Line the diffuser up again. Mark where the bolts touch the bumper. One of you does the marking.
17. Before you drill any holes put your hand behind where you intend to drill to make sure there is no metal plate there. If all OK then start drilling.
18. After one side is done, it is time for another drink.
19. After your drink drill the hole on the other side.
20. Now line up the diffuser and hopefully you drilled the holes in the right spot and they are large enough for the bolts to go through.
21. If the holes are too small or they don't line up put the diffuser down gently take 5 steps back, say Oh Sh***t in unison with your mate, finish your beer off it will make things better.
22. After beer is finished drill larger hole as required, line up diffuser and see now it just fits right and holes you drilled cannot be seen.
23. You now say to your mate that your f***ing brillliant, this is going to look fantastic.
24. Give a final rub of rubbing alcohol to make sure all residue of old glue is off.
25. Sit back and open next can of beer, and have a drink.
26. Now line up the diffuser again, all looks good, now remove the backing tape on the diffuser's double sided tape.
27. Line the diffuser up and gently tighten the nut on each bolt as your diffuser gets closer to the bumper when it is close you both then push the diffuser up so that the double sided tape makes contact with the bumper. Keep the pressure on for a few minutes.
28. Tighten bolts but do not overtighten.
29. Sit back job is done, admire Neal's creation, admire your installation with your mate and finish the beer off.
30. Tidy up, start engine drop ride height back to normal level take car out of garage. Switch engine off, get out of car walk around and admire that rear end.
31. Time for photos. After photos taken, download to computer. Log on to mbworld and post them up.
I hope this helps those that haven't installed their diffuser yet.
I will post my pics as soon as I can.

It looked so good lined up, I didn't take it off again.
Thanks for the extra instructions AMG055
1. Things you will need first, socket set, stanley knife, drill and drill bit, clean old cloths, rubbing alcohol, maker pen, 6 cans of cold beer of your choice, someone to help you (3 cans of beer are for them).
2. Raise car height to highest setting.
3. Undo the 2 bolts that hold up each exhaust as suggested by Sunpointer.
4. Use the stanley knife to cut the plastic rivets that are located on the stock black piece around where the exhaust pipes are. Some mention screws, mine were plastic.
5. Its now time to open can of beer, have a drink or 2.
6. Now cut the plastic rivets on the other side.
7. This is thirsty work so better keep hydrated and have another drink.
8. For clarity, the piece to be removed is the unpainted part on the rear bumper.
9. Lift up one corner and rip it off. It may come off in a small piece or a large piece. Doesn't matter how it comes off just keep peeling, when you get to about half way, time for another drink or 3, this part of the removal process makes for very thirsty work.
10. After re-hydrating continue peeling until you get to the end.
11. If not finished, finish that can off now.
12. Double check all the plastic has been removed.
13. Now rub the area down with the cloths and rubbing alcohol.
14. Now sit back and open that second can of beer.
15. Unwrap the diffuser. Jiggle the bolts gently to see if they are loose. If they don't come off you will need to drill a hole on either end of the bumper.
16. Line the diffuser up and get an idea how it will fit. You also will get an idea how your car will now look.
17. You see that the car already starts to look good now and you get excited. Your mate also tells you how good it looks. Time for another drink.
18. Line the diffuser up again. Mark where the bolts touch the bumper. One of you does the marking.
17. Before you drill any holes put your hand behind where you intend to drill to make sure there is no metal plate there. If all OK then start drilling.
18. After one side is done, it is time for another drink.
19. After your drink drill the hole on the other side.
20. Now line up the diffuser and hopefully you drilled the holes in the right spot and they are large enough for the bolts to go through.
21. If the holes are too small or they don't line up put the diffuser down gently take 5 steps back, say Oh Sh***t in unison with your mate, finish your beer off it will make things better.
22. After beer is finished drill larger hole as required, line up diffuser and see now it just fits right and holes you drilled cannot be seen.
23. You now say to your mate that your f***ing brillliant, this is going to look fantastic.
24. Give a final rub of rubbing alcohol to make sure all residue of old glue is off.
25. Sit back and open next can of beer, and have a drink.
26. Now line up the diffuser again, all looks good, now remove the backing tape on the diffuser's double sided tape.
27. Line the diffuser up and gently tighten the nut on each bolt as your diffuser gets closer to the bumper when it is close you both then push the diffuser up so that the double sided tape makes contact with the bumper. Keep the pressure on for a few minutes.
28. Tighten bolts but do not overtighten.
29. Sit back job is done, admire Neal's creation, admire your installation with your mate and finish the beer off.
30. Tidy up, start engine drop ride height back to normal level take car out of garage. Switch engine off, get out of car walk around and admire that rear end.
31. Time for photos. After photos taken, download to computer. Log on to mbworld and post them up.
I hope this helps those that haven't installed their diffuser yet.
I will post my pics as soon as I can.
I'm posting this up while I take a little break. It's HOT outside...

I was a little confused about the steps you posted regarding removing the stock plastic piece but after taking it off, I realized it makes complete sense LOL.
I'll post pics tomorrow after the glue dries.
Got the nut on snug fit without lowering the exhaust. Just wanted to see how it fits.
Question: how much border are you guys leaving between the Diffuser and the bumper. Like no space or like 2-5mm?
I can't get the diffuser sides to close in on the border space while the diffuser center is snug flush (barely 1mm) from top middle of diffuser to bumper..
Should it be snug fit from side to middle to side or should there be like a tiny border space from left to middle to right top of diffuser border.
I'll try to tighten the nut more but afraid to over do it, it's about less then half way now.
I might need to get that 3m Tape and do a redo if its not sorta reusable for once more fitting. Anyone have a good source for that 3m Tape?
Last edited by NRL; Jun 27, 2011 at 08:45 PM.
Got the nut on snug fit without lowering the exhaust. Just wanted to see how it fits.
Question: how much border are you guys leaving between the Diffuser and the bumper. Like no space or like 2-5mm?
I can't get the diffuser sides to close in on the border space while the diffuser center is snug flush (barely 1mm) from top middle of diffuser to bumper..
Should it be snug fit from side to middle to side or should there be like a tiny border space from left to middle to right top of diffuser border.
I'll try to tighten the nut more but afraid to over do it, it's about less then half way now.
I might need to get that 3m Tape and do a redo if its not sorta reusable for once more fitting. Anyone have a good source for that 3m Tape?
About the 3M tape, Napa, Advance Autoparts, Auto Zone and most auto part stores have the 3M tape. Make sure its 3M though.
so I wanted to post it here to see if we can finish up that deal too in case some of you did not see that thread. Here is the linkhttps://mbworld.org/forums/cl55-amg-...ml#post4734821







Now I can sleep at night.