rm48

Quick question regarding installing a non porsche roll cage in a 997.2 gt3rs. In order to install the roll cage, you need to drill holes in the floor of the car to install the front section of the roll cage. Is this typical? Is it anything to be concerned about? Would this be the case to install an OEM Porsche roll cage as well?
Any help would be greatly appreciated. Thank you!

TypeRS

If you care about the future value of the car, it is a concern.

If you intend to drive the car on the street my general advice would be that un-helmeted human heads and metal bars generally don't mix very well.

rm48

Appreciate the response.
So the OEM roll cage does not drill into the floor of the car?

TypeRS

I am not sure where you are located or where your car is from.

From FVD site:

Technical Info:
European GT3 RS and Club Sport versions are factory equipped with the mounting points. When installed in US and Touring versions of the GT3 and GT2 mounting points must be installed (Installation kit 996 580 982 1999 order separate if necessary).

rm48

Its a US car. So the mounting points need to be installed, which is what the drilling is?
If the mounting points need to be installed, the result would be a Euro spec - which is already equipped with the mounting points. So why then would it a concern to drill the floor to install the mounting points, or am I missing something?
Really appreciate your responses, very helpful.

powdrhound

The Euro spec cars have weld in plates installed at the factory. US cars did not except for a few of the early ones. You will need to install these.... There is also a plate (with 3 studs) that is installed underneath the car (the rubberized rust proofing needs to be cut away and resprayed) which effectively sandwiches the OEM floor board and the top mounting plate between the lower plate and the roll bar feet. This gives you some meaningful roll over protection as it's relatively structural as opposed to the aftermarket bars that attach to the seat anchors with a single bolt. Those are effectively harness bars disguised as roll bars, nothing more. From a resale standpoint, if installed properly, the OEM IVM Clubsport or Heigo bars are not going to effect resale value. Any of the aftermarket bars in my opinion will negatively effect resale from a purists standpoint. Just my $0.02..

gmgracing

Our 997 GMG RSR Harness-Rollbar does not require the drilling of holes in the floor of the car. It mounts to the seat belt anchors at the B-pillar and to the rear upper strut mounts. This way, it is less intrusive than the factory rollbar.

https://shop.gmgracing.com/collectio...arness-rollbar

TypeRS

Any time you are doing something irreversible that didn't come with the car, people may view it as a negative. Porsche owners are very particular about having the car completely original the way it was sold off the lot.

Welding the plates in may not impact the perceived value to some buyers, it will deter others. Again if you care about safety on track (with a helmet) and care less about resale value, then do what is right for you. Only you can answer that for yourself.

bmwtye

Go the full OEM route, dont mess with anything else.

Here are the plates you need. This is for front and rear:
https://www.fvd.net/us-en/9965809829...7-gt3-gt2.html

Here is the full front and rear OEM carpet for the clubsport bar. FVD can get this too.
OEM Euro GT3 center Carpet that has the cutouts for the front and rear ClubSport sections is $1583
997 551 011 90FLW . 997 GT3 RS Center Rollbar Carpet Kit - Black - I003

And if you are looking, I am selling my OEM clubsport front and rear bars.

Tom@TPC Racing

I assume when you say roll cage you mean a 4-point rear section, which is often referred to as a "roll bar". If that is what you mean, most of the aftermarket bolt-in 4-points don't require any drilling.

Belinko

So many options and many opinions.

1. There are factory full race roll bar solutions and non-factory roll bar solutions.
   • factory solution for US cars require drilling and welding, all OEM parts can be purchased and used for front and rear roll bar sections
   • non-factory solution for US cars require drilling and welding for custom cage
2. Four point bolt in harness bar/roll bar (no drilling or welding), not intended for wheel to wheel racing
   • typically they are bolted to the rear shock towers, just like OEM
   • typically anchored to the bottom of the B-pillar into the seat belt bolt, each vendor has a slightly different design when it comes to this attachment point
   • variety of vendors sell these, with a variety of differences:
     • different materials and tubing sizes/wall thickness
     • all are welded together in different design configurations and bracing strategies
     • some harness bar/roll bars are single piece others are multi-piece, depends on the overall design
     • different overall spacing with regards to the headliner, B pillars and back most seat position

If overall cost is not an object or "preservation of OEM, concourse" go for the OEM route as mentioned above. If racing competitively perhaps go full custom. If track days, HDPE or cars and coffee I think any of the 4 point bolt in bars would be sufficient and everything is reversible to OEM.

For my 7.1 GT3 I went with a DAS rollbar, it fulfills my functional (HDPE) and budgetary needs (not $5K), it's beefy and has a foot plate unlike many other bolt in 4 point bars.

My $.02, cheers

MJSpeed

What’s your intended use for the car? Why are you installing a roll bar/cage?

mooty

street use, do not put in bar
track use, most ppl don't drive often enough on track to need a bar
if u do drive enough on track, buy a track car with trailer and full cage
if u just want the look, any car will do
if u like safe, OEM is the way to go
there's a reason why front legs are bolted to a welded plate

rm48

thank you for the response. I am asking because I am eyeing a car. The seller sent me these images of the installation of the roll bar:




looks like they just drilled through, correct?
something to be concerned about?