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I guess you determined that the seller couldn't help - he didn't have the missing piece?

 

If you can't get the actual part, I would try to take the similar piece off the non x51 box and modify it to fit nicely. That's prob the closest thing to it and a stock airbox should be to expensive o get a hold of 2nd hand. Maybe try dismantlers.

Ken.

 

I was at my local dealer yesterday and tried to look up the part for you. According to the parts manager, the only way to get the part is to give them a VIN # of an X-51 car. This will bring up all options on the car, thus the part number. Maybe you could ask user: kkswow12 to call his local dealer and get the part number. He started the thread below.


https://www.6speedonline.com/forums/...dd-x-51-a.html

 

I stopped by my dealer this morning and the parts manager looked up the full list of parts available for the x-51 powerkit. According to the PET system, there is no individual part # for the accordion piece and Porsche will only allow them to order the whole airbox. I think your best and maybe only bet is to get one off the regular airbox and modify it to fit.

Let me know if I can help with anything else.

 

Here is a part # for a 996 airbox flange, should fit a 997. I used it on a evo airbox for my 997 for the gap between lid and intake. 996 110 250 52 about 20$.

 

That the part which clips into the decklid? Got an image please?

 

It's part #10


http://www.autoatlanta.com/porsche-p...=99611025052#a

 

Hi there

Managed to get on the dyno yesterday to compare the 200 cel NHP straight cats compared to the stock cats.

Car spec:-
997.1 C2S
Stock airbox, resonator section removed and capped off.
BMC panel filter
Silicone hose
X51 manifolds
Centre radiator
PSE
Stock cats VS 200 CEL straight pipe cats
Softronic

Dyno Comparison:-



You can see the cats are giving me what I felt on the butt dyno, little to zero losses down low, with increased coming 3500rpm upwards with a peak gain of nearly 30BHP at certain points in the rev range and approx 10lb/ft gains across the rev range.

So 200 cel straight pipe cats definetely work on our cars with softronic, no low-down losses and gains 3500rpm upwards. Removed softronic and the results were similar though it was helping with low/mid range for sure, but up top talking about 4-5BHP, not bothered to add comparison with and without softronic as its close, though it does help.

Think what this proves is a full de-cat does not work on our cars, it looses lots of power below 4000rpm, even with softronic, though gains above 5500rpm are large, shall add full de-cat comparison to 200 cel comparison in the week as need dyno shop to email me the PDF file of this.

In short, if you don't want to loose low-down power/torque go with straight pipe 200 cel cats from either NHP or AWE. The X-Pipe designs definetely loose low-down power/torque and also loose some of that classic Porsche sound track. An X-pipe 200 cel pipes will no doubt gain a little more up top, but as I say at dis-advantage of loosing down low. Full de-cat either way, your gonna loose low/mid range for sure.

Gonna try to get the plenum, throttle body and X51 airbox fitted within next couple of weeks and head back to the dyno.

I am happy with the results as the BMC panel filter, X51 manifolds, 200 cel cats and softronic have gained me 16-20BHP peak along with 35ish BHP and 10-15lb/ft at points in the rev range.

Hopefully the addition of the X51 airbox, throttle body and plenum will bring me upto true X51 power of approx 380BHP with good gains across the range.

 

Gibbo, great to hear the cats are working well for you. Looking forward to your plenum and TB dyno!

 

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very nice. kinda wish i didn't have an extended warranty, as i would be all over some new cats!

 

For those interested, here is a comparison between the Sport Cats and the full De-cat X-pipe, which also sounded bloody awful!



Now you can understand why I thought the car felt gutless between 2000-4000rpm, because of the 45lbft and 30BHP loss as the plot shows, though gains beyond 5500rpm not bad. Still with a 911 sports cats is the way as the engine design requires some back pressure.