Yep mine are in porsche boxes too! I got them from sun coast and confirmed with an employee that they are indeed for our cars. What’s gonna happen when Porsche runs out haha

 

So the Brisk rep wrote me back, here's what he said:"The BOR14LGS design I think would be a plug option but ultimately, I don't think it would be the top recommendation purely based on the spark plug gap requirement by the GT3 platform. They require a pretty tight gap specification which is right around the effective gap of the LGS design. As the plug wears the gap could potentially become too large and out of spec and it could result in a misfire.

For the GT3 platform NGK references their factory heat range as a NGK 8 - cross referencing the Y5DDC to other brands such as Denso they reference a NGK 7 heat range as well as an NGK 8 also. I believe that it would be better to go with the colder of the two personally.

For a stock platform GT3 in these year ranges our top recommendation for a street plug would be our Brisk Premium EVO BR12BFXC.

For a stock platform GT3 for a race spark plug, our top recommendation would be our Brisk Silver Racing BR12S. The Brisk BR12S utilizes a non-projected insulator tip configuration that would benefit your application during heavy duty cycles as it combats knock more effectively which would keep the ECU from pulling timing, especially when heat soak becomes a factor."

Best Regards,

Bret Lednicky


Here is the EVO version he's talking about:
https://www.briskusa.com/spark_plug/br12bfxc_spark_plug
And the BR12S:

https://www.briskusa.com/spark_plug/br12s_spark_plug

 

So most of the plugs that came in the Bosch box had blue stripes on the porcelain, and the tips were different than the one on the left. But, as the years went by, the Bosch boxed ones were also showing up with green stripes, and the different tip. They all worked, but it's good to keep it in perspective:

 

The Bosch rep said no more, including the special dealer ones on Porsche boxes. BMW E36 M3 cars also used the Y5DDC and now need alternatives.
The NGK link I posted shows only that plug, which is 1 step colder than the Y5DDC, and has 2 ground electrodes just like the Bosch. However, other crossover chart sites have other modern NGKs, and the heat range is 7, which in NGK is equivalent to Bosch heat range 5.

There are 2 spark plug threads going on in the 997 GT2 GT3 forum, I've tried to post all the findings on both threads.
It would be nice if someone could speak to a major dealer about this, and if BBI, Sharkwerks, Dundon and other performance shops could offer their opinions-

Here's a cross reference chart for the Y5DDC:
https://www.sparkplug-crossreference...BOSCH_PN/Y5DDC

There are 12 NGK plugs listed, and they're all heat range 7.
But, as posted before, the NGK site only lists the DCPR8EKC as the plug for Mezger GT3 cars.
With so many plugs offered, NGK's own site doesn't seem to offer enough info and options.
And if they made a DCPPR7EKC to match the Y5DCC heat range it would be perfect, but they don't.

Here's a close-up pic of the Brisk, it has 6 ground electrodes(!)


JB

 

Also, I think only the European BMW E36 M3s used the Y5DDC plugs,
This site in Denmark has them"original"(probably BMW box) and "alternative" Y5DDC

If someone wants to contact them and see if they are indeed in stock, maybe shipping isn't too bad:
https://www.schmiedmann.com/en/produ...ct=12129065004

"Original":
https://www.schmiedmann.com/en/produ...2-12-9-065-004

 

I may be loading up on a few sets of plugs before they are gone forever haha. Perhaps buying a few sets from suncoast.

 

FWIW, I too saved a buck getting the OEM plugs over the years, If those aren't available, I'll just buy from Porsche now.

 

Spyerx, the Bosch rep told me they're discontinued, and that includes the Porsche dealer packaged version.
Get them while they have them, if they even have them-
As mentioned, I'd call the dealer before ordering online or go in person

 

The NGK vehicle finder only lists the standard version of the DCPR8 plug, but a Platinum version exists.
Here they are compared, but only the standard one is listed as compatible for the 997 GT3 cars. Would the Platinum version be a good choice, and not listed as compatible because the Bosch plug for GT3 was never offered in Platinum?

The reason I found the Platinum version was because I searched for BMW DCPREKC and found that the BMW motorcycle riders opt for the Platinum version, or the single ground electrode Iridium version.
So here are the two dual ground electrode plugs compared. There is a difference in the projection, the Platinum says "extended projection":

https://www.ngk.com/compareproducts

Rockauto, $5.98 for the standard NGK:
https://www.rockauto.com/en/parts/ng...park+plug,7212

 

Ok, NGK's website is an irritant, I does not retain the compared items. Here's a screen shot:

 

The Platinum version of the NGK is stock number 7415
When you search NGK's site for Porsche 997 GT3, only the standard version comes up. This is probably because the Bosch Y5DDC was a standard plug.
I posted the screen shot of the two NGK plugs, and these are the only ones with dual ground electrodes.
The Platinum plugs are between $6-$14 depending where you get them. FCPeuro has them, Ecs tuning, Jegs, autohauz etc

Here's a link
https://www.carid.com/ngk/laser-plat...-mpn-7415.html

So to sum up the NGK option:

DCPR8EKC is standard, NGK site lists as their plug for the 997 GT3 cars
DCPR8EKP is the Platinum version, not listed for the 997 GT3.
However you interpret this, it is most likely because Porsche only used a non Platinum plug, the Bosch Y5DDC
It would be interesting to call NGK and speak to a qualified rep and ask about the Platinum version. Otherwise, the standard version is probably the best choice. Ferrari, BMW, Alfa and other cars come with NGKs...

JB

 

JB.......Thank you for all of your excellent Sleuthing on this! Great Job, and much appreciated.
Cheers
Doug N

 

So seems like when the time comes, one of the NGK plugs should work

 

Thanks Doug,
I think I've reached the end of my investigation
As it stands, after I use my Bosch plugs I'll order the NGKs. I'd still like to know from NGK if the Platinum version is OK.

Ferrari 458 plug is similar, but even smaller, 10mm threads. Same story, dealer box, 4X the price:

 

I googled the standard ngk one (DCPR8EKC) and on o'reilly's, it says it will fit the car. so I think you found a winner. Sounds like the brisk ones could work too but I've heard from peers of mine NGK makes a good plug.