The carbon slicktop thread

[SQ13]

Forgive the denseness but I'm still a bit confused. You're basically saying because of the lack of angle cut on the front of the karb roof, the panel does not sit as flush as it would if there was an angle cut like on the OEM panel, and thus might have adherence/gluing issues? Also the roof is an extra 7mm forwards because of it?

Yes, installing as is would cause the roof to sit on top of the nub, which would cause a large gap between the roof and flat portion of the body. This would most likely cause issues with windshield install.

You must do one of the following to prevent this:
1. Grind down the nubs
2. Cut roof corners at an angle like OE to clear the nubs

No, the overhang is not due to the above..it’s a separate thing I noticed. The front lip just happens to be larger on the Karb roof. You can either leave it or cut the excess lip off. Only one person has documented cutting off the excess; after watching some vids and talking to some people who have installed the Karb roof, I’m pretty sure most people just leave it.

The fitment of the roof is perfectly fine. The alignment of the exposed/raised portion of the roof lines up perfectly with the roof rails and pillars.

[bigjae46]

Wear a respirator if you cut/grind or even drill carbon. The dust is as bad as asbestos.

[bigjae46]

OEM slick top 18.4lbs
OEM roof w/sunroof & shark fin - 24.5lbs
Sunroof opening plug - 3lbs

all carefully measured on my calibrated bathroom scale 🤣

[ac427]

What is the weight saving on a non-sunroof car?

[bigjae46]

What is the weight saving on a non-sunroof car?

The OE panel is 18.4lbs minus whatever the carbon part weighs.

[ac427]

The OE panel is 18.4lbs minus whatever the carbon part weighs.

I think the CSL roof only saved a couple of kilogrammes.
Is the weight of this carbon roof unknown?

[bigjae46]

I think the CSL roof only saved a couple of kilogrammes.
Is the weight of this carbon roof unknown?

It will vary depending on how the roof is made. My roof is 5.4 lbs so I'm saving 22lbs. I think most roofs are between 7-9lbs. Again, varies based on who is making the roof and what their layup schedule is.

[eXpensiveGears]

answered.

[LSB4Me]

When there’s a will there’s a way! Huge day for myself and my OEM LSB CSL tribute build. Thank you to the special person who made this all happen , you know who you are.

Did you ever get this on your LSB? Curious to see how the CF looks against our color.

Congrats on going all the way with your car.

[Slideways]

Did you ever get this on your LSB? Curious to see how the CF looks against our color.

Congrats on going all the way with your car.

https://bringatrailer.com/listing/2004-bmw-m3-36/

[Arlen4369]

Did you ever get this on your LSB? Curious to see how the CF looks against our color.

Congrats on going all the way with your car.

Thanks 🙏. I got it on, abs auto body did the job perfectly

[dHam_Slow.46M]

Thanks 🙏. I got it on, abs auto body did the job perfectly

Mind me asking how much ABS charged for the service? My sunroof cartridge finally went out recently and seeing how they fair compared to my local go-to shop

[Arlen4369]

Mind me asking how much ABS charged for the service? My sunroof cartridge finally went out recently and seeing how they fair compared to my local go-to shop

best to call and ask for Kevin, he is very professional and will give you quote on spot. There is no one else I would trust for the job 626-279-6485

[Arlen4369]

https://bringatrailer.com/listing/2004-bmw-m3-36/

not my car but this was recently purchased by my good friend.

[Epsilon]

I recently had a carbon slicktop conversion at a popular Southern California shop. My car was transported over to the shop and I was unable to inspect the work in between or after until it was transported back. I also had my own carbon roof which was transported to the shop. I have my own headliner which I did not ask the shop to install. The shop owner was easy to reach and friendly at the time and I'll just leave it at that.

For anyone else looking into doing this, let this be a list of items to look out for.

Here are my observations after getting the car back:

*OEM Windshield is misaligned. This is visually obvious with how much gap there is on one side compared to the other (see photo).
*I see scratched paint in the side gutter of the windshield seal like a metal screw driver was used to pry it.
*New windshield seal has a 1-2mm rip
*Parts of the front and rear windshield seal edge were folded in. As simple as it sounds, I used a trim tool to lay the edges flat against the glass
*Glued on roof rail on one side is misaligned. Where the rear window seal and roof rail meet, the window seal protrudes up compared to the other side.
*Inside, there are drilled holes that are not sealed or rust protected
*I see a pried sheet metal roof panel flare out (see photo)
*I see multiple drilled through holes. Instead of drilling just enough to separate the roof panel, welds should not be drilled through.
*Although water tight from my own testing, there are internal areas where I am expecting to see glue but don't see any used.
*The trunk antennae hole was not covered and my trunk was soaked. This also caused condensation in my left taillight. I think this was during the water test for leaks. Owner told me to cover it up with a plug, but in my head I'm thinking why he didn't just tape over it in the interim if he knew about it.
*My C-pillar covers were yanked out instead of properly removed
*My rear tint was scratched up along the edges
*My roof rails were painted black, but I see dirt particles under the paint. I feel like using my nail to scratch off the dirt, but it's painted over.
*Will have more photos when I get a chance.

In short, I love the way the carbon roof looks but wish the workmanship was better.

In terms of drive, I can feel the car having less lean around street corners, but my main goal was mainly aesthetics.