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