Joe731

Best I can tell there are at least six different roll bars available for the 991 GT3RS as follows:

1.) GMG RSR harness bar: ($2,395) 4130 Chromoly Tubing, Maximizes available rear space. Bolts to shock tower and lower seatbelt anchors. X-brace+harness rear, nothing front, harness bar mounts to rear.
http://www.gmgracing.com/store/2015/...-roll-bar.html

2.) GMG LMS Harness Roll bar: ($2,595) 4130 chromoly tubing, Stronger as it mounts to shock towers and B pillar bulkhead. X-brace + plate front, harness bar rear, harness mount on rear bar.
http://www.gmgracing.com/store/2015/...-roll-bar.html

3.) Cantrell Bolt-in Roll bar: ($2,500 + $250 in custom color) 1.75″ X .095 4130 chromoly tubing, X brace rear, modified X front, harness mounts to front bar. Mounts like GMG2
http://cantrellmotorsport.com/produc...t-in-roll-bar/

4.) KAI Motorsport Roll bar: ($3,700) 1.625″ x 0.095″ 4130 chrome moly steel tubingSame mount as GMG2, X-brace front, X-bace+harness bar rear, harness mounts to rear bar
http://www.kamotorsport.net/product/...t-in-roll-bar/

5.) BBI Roll Bar ($?,???) Looks like the KAI Motorsport Roll Bar
https://www.mygermancarsa.com/new-bbi-991-gt3-roll-bar/

6.) RSS 940-XC Roll Bar: ($1,895) 1.5" tubing. Attaches like GMG2, rear diagonal, x plus harness bar front. Top tube is straight, not contoured like others. Make pitch that harness bar closer to seat is better as less harness stretch.
http://rss.rpmware.com/rss/rss-940xc...i-2208501.aspx

7.) Adding Alexshop GT3 Harness Bar: ($2,495) 1.75" and 1.5" DOM tubing. Attaches like GMG2, rear diagonal, x plus harness bar front. Top tube is straight, not contoured
http://alekshop.com/products/porsche...91_harness_bar


So how to decide?:

a.) If you want most access to rear, then #1
b.) If you want some access to rear, then #3
c.) If you want most braced, and most expensive, then #4 or #5
d.) If you want thickest tubing, then #3
e.) If you want lowest price, then #6 (doesn’t state 4130 chromemoly, doesn’t contour roofline, which they say is stronger)
f.) If you want harness bar in front, then #3, #6, or #7

That's the best I can tell from their web pages. Anyone else done this comparison and have other observable differences??

BBiAutosport

Joe,

Thank you for mentioning our BBi Autosport Roll Bar!

Please allow us to clarify a few things:

Designed and manufactured by BBi Autosport, we released our Porsche 991 GT3 Street Cup Roll Bar earlier this year.

KA Motorsports is our authorized dealer and requested additional features to be added on our cage. Manufactured by BBi Autosport, KA Motorsports marketed that specific version as the "KA Motorsports Roll Bar".

BBiAutosport

To inform members that are not familiar with our roll bar, here are some pictures and information.

BBi Autosport Porsche 991 GT3 StreetCup II Bolt-In Roll Bar

Now Available and Specifically Designed for 991 GT3 GT3RS Models





The BBi Street Cup roll bar features a 2 piece design and 4130 chrome moly steel tubing (1.625" x 0.095) for excellent strength to weight ratio. With our sensible design approach, the 2 piece design mounts to frame structure, utilizing factory bolts, to provide strongest mounting points and maximum protection. For superior strength and rigidity, the bar utilizes "X" braces on both front and rear sections and each joint has been meticulously TIG welded by hand. Bolt-in installation is accomplished by using Inner Diameter Tube Clamps that are CNC turned and milled for a precise fit. These unique joints allow us to eliminate the more traditional slip fit tubes with an unsightly through-bolt and nut.

Inspired by Porsche’s motorsport program, the BBi Street Cup product line represents the culmination of our winning experience in professional motorsports and the extensive R&D efforts with our in-house fabrication, suspension engineering, and engine development programs. All of the experience gained with our successful racing background combined with state-of-the-art materials and the highest quality manufacturing have yielded performance upgrades that are worthy of the Porsche 911 name.

Features

• 1.625" x 0.095" 4130 chrome moly steel tubing utilized for excellent strength to weight ratio
• TIG welded and utilizes "X" braces on front and rear sections for superior strength and rigidity
• Mounts to frame structure (utilizing factory bolts) to provide strongest mounting points and maximum protection
• Utilizes laser cut mounting plates & inner diameter tube clamps that are CNC turned and milled for a precise fit
• Designed to work with stock seats or any aftermarket seats on the market
• Allows full seat travel to accommodate taller drivers
• Can be used with stock seatbelts or 6 point harnesses for track use
• Designed to work with wrap-around style harnesses while optional eyelet bolt provisions are available for clip-in harnesses
• OEM fit & finish. The main hoop contours entire arch of the roof with an even 3/16 inch gap
• Finished in satin black powder coat. Other colors available Bolt-in installation requires no drilling and minimal carpet trimming
• Made in USA

Beauty shots of the BBi Porsche 991 GT3 Street Cup roll bar in bare metal to showcase the pretty welds.


(Click on images for higher resolution)















For all questions and inquiries, please email Jerry@BBiAutosport.com or Sales@BBiAutosport.com

BBiAutosport

Here are a few pictures of our BBi 991 GT3 StreetCup Roll Bar installed.
To match the matte white vinyl wrap exterior, we gave the bar a custom matte white finish.


(Click on images for higher resolution)











-Jerry@BBiAutosport.com

TRAKCAR

If you're in Florida KA is no brainer. The guys installed all 3 my ClubSport roll bars in my RS..

BBiAutosport

Marius is definitely a good guy to represent BBi Autosport products and serve the Porsche Community. His background in professional motorsports is definitely highly valued.

While it will definitely compromise strength, we can omit the from main "X" from our roll bar to allow better access.

- Jerry@BBiAutosport.com

TRAKCAR

Call it a harness bar...

BBiAutosport

Here are pictures of our BBi Autosport 991 GT3 Satin Black installed into a Porsche 991 GT3 with LWB Seats:















- Jerry@BBiAutosport.com

Mech33

Don't forget the Alekshop harness bar (they're all harness bars, really): http://alekshop.com/products/porsche...91_harness_bar

GMP911

+1 Alexshop great quality and customer service

Mech33

Alekshop was even willing to do a 1-off custom bar for me (I didn't want the cross-bars blocking any more of the rear view mirror than the spoiler did already!):

ipse dixit

Another +1 for Alekshop.

But do we know yet if the 991 GT3 Alekshop bar fits the RS?

I asked him, but never heard back ...

Mech33

I don't see why not... the interior dimensions are identical, no?

ipse dixit

Aleks said he was 99% sure it would fit, but needed to get an RS to confirm.

But I agree, can't see why it wouldn't unless the bolt points are somehow different.

gmgracing