Without my estimating system to be more exact I would say you're looking at 3-4k.
Now if you're handy or have a friend with body shop experience this can easily be done in a garage.
Pay a mobile glass guy $700ish to come remove both pieces of glass. $300 in panel bond and seam sealer. Start...
I was looking at the HGK roof but IMO that's a racecar part not a street car part. They themselves say don't expect perfection and the fact that they didn't build in the ridges for the roof moldings to clip on to says that. Without those there you would have to double side tape the roof moldings...
Seibon says it's 4.8 pounds saved. Feels about right. Seibon also lets you reuse the headliner. Any carbon roof should let you reuse the headliner as it clips into the reinforcements of the car. Nothing on the roof itself.
I tried researching on the forums before my brother and I did the install but seemed like there wasn't many DIY threads about it so I figured I would do one just incase anyone else is willing to do it on their own.
Full disclosure my brother and I both work at a body shop making this very...