I replaced my stock exhaust with a Kline system, but need some additional vacuum line to extend the existing lines to the location of the valves on the Kline. I bought some tubing at Home Depot but it's melted a little and want to replace it with the correct material.

Does anyone know what material and size the exhaust vacuum line is? Or a part number to order it from the dealer if I can't find a generic replacement?

Thanks

 

Any silicone line from amazon or ebay should be fine, no reason to pay $LOL$ for Porsche-specific stuff that probably won't be the right length anyways.

My guess is 3/16" but measuring the barbs should be easy enough if no one else can chime in with sizing!

 

Take a piece of the original hose, head to Napa or any auto parts store and ask for vacuum line. They should be able to help.

 

Just closing the loop on this one for anyone searching for this information in the future.

The part number for the vacuum line is 900-918-005-40 (Vacuum Tube). It comes in a 1 meter length that you can cut to size.

You may also need an extra connector elbow, which is 948-110-126-00 (Vacuum Hose Elbow)

 

The OE vacuum line for PSE is 4AN (3/16 or 5mm ID) stainless braided teflon/PTFE lined hose. I was able to buy it from a local hydraulic hose shop for $8 a foot. If you want to get it online many racing shops, ebay, or amazon have it.

I had to make custom line for my Cargraphic exhaust. Ended up using longer metal line + covering it in DEI Fire Sleeve + using a line clamp thing to keep it away from the muffler. Since doing this I haven't had any issues in a year, even with some track days where I had issues prior.

 

Where did you get the t adapter?

 

The same hydraulic store I bought the line.

You could probably get something that would work from Home Depot.

 

I have the Kline system, mine got a bit melted so I replaced with this one

 

did anyone notice a loss of horsepower after keeping exhaust in open position? I unplugged and capped the vaccum line, I feel the car is not performing as well but it could be in my head...

In theory better exhaust should mean better power, but maybe its designed to need that pressure at certain stages...

thanks,

 

Nothing really better about it. Post-cat there aren't really flow issues to speak of. It's the cats that are your restriction.

The difference in power is somewhere between zero and "so little that you cannot reliably measure it with a dyno" -- I would be truly shocked if you could feel it or reliably show quantifiable differences with lap times.

Also that's a Cayman. We're in 991 land here!

 

Hi do you recall if you went with the 3mm ID or 5mmId option? I'm asking for a 2024 Cayman gts.

Thanks,

 

I used a 4mm ID silicone hose from amazon. Silicon is heat resistant and the 4mm ID made a nice connection. The nipple size is around 4.8mm on the valves.