Hello,

on my 3.8 non-pse, i've pulled off both vacuum hoses and capped them.
however, after few days of driving, i've noticed when the ac is on full blast, it would make a high pitch squeaking noise from the back(the rubber hose caps). so i've plugged back one of the sides and the noise is gone now. and of course it's not as loud as unplugging both.......

now im looking for an exhaust w/out valves or getting one and wanting to just keep them open at all times since i don't have a pse swith.

so the question is, would i get cel by just unplugging the hoses w/out capping them?
i've called fabspeed and they said to just tie them away when installing with their system. but the porsche dealer said that it would throw cel once it detects a leak????

anyone have any experience with them?

thanks in advance!!!

 

Your caps must be too big if they are leaking.
Why not cap the port at the COV instead?
Also, add a wire tie or clamp to the cap.

 

Thx!!
i'm pretty sure the caps weren't too big... it was pretty hard getting it on there.

but i think i'll try out the clamps though......

also, if i capped it at the cov, do i have to remove the bumper to get access to it? do you know which hose on the cov leads to the exhaust valves?

thanks again!!!

 

You shouldn't get any cel entries if you've completely capped or clamped shut the vacuum lines. Cel message happens when vacuum is applied and due to open end controller value doesn't change. I've never tried just tieing the lines off....
Look at any exhaust replacing the center non or pse exhaust. AWE and Fabspeed both offer non-valved center muffler deletes....

 

Thanks!!!!!
I do have the non-valved awe center bypass from my previous 3.4 991 but that design makes everything come out through the side muffler. I was looking for ones that are designed like the awe valve version that has two coming straight out the back when valves are opened and two through the sides. But just without the valves.. But I'm gonna try capping both valves again and if it works w/out any sounds. then I'll just look for the valve versions and just have them open all the time.

When i had both my vacuum hoses capped on the 3.8, it was louder than the 3.4 w/ awe center. Just w/ less crackle and pops, which Is why just capping both hoses alone may not be enough.....
I also looked at fabspeed w/ side muffler delete, but read lots of comments of being too loud.