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Found 2 results

  1. Hi all, This will be my first post, thanks for a great forum ! I've recently purchased a exhaust system from Design911 in the UK which has the valvetronic function on. This is said to replicate the PSE which my car does not have factory installed. Wired it up and put the vacuum hoses, tested the system and it works fine. Over to the issue for my car: When starting up the car, the neutral positon of the valves is open, which means a lot of noice from the exhaust. When switching this by the solenoid, sending vacuum into the system and the valves closes. This means less sound. But when the valves is closed the car wont run properly at the RPM range of 5500-7000 RPM's there is also fault codes for misfire on cylinder 2. The strange thing is that this works perfectly when the valves is open. I've tried two differnet vacuum sources, into the ressonator and also for the left hand side cooling system vacuum solenoids. Without any differnce. I tried to run vacuum directly to the vacuum actuators on the exhaust without any difference and also tried manually applying vacuum and using a one way check valve to keep the vacuum while not connected to the cars vacuum line. No vacuum leaks, no fault codes when driving with the valves open. Same result every time. So have anyone had some similar issues to their car ? Thanks in advance for any help !
  2. Will installing 200 cell cats on 997.1 cause a CEL? If so, is there anything that can be done to eliminate it? Also curious whether their use on car with PSE will significantly increase exhaust loudness as I'm not really looking for more sound. Appreciate any feedback including performance experience when combined with competition throttle body and intake plenum. Thank you.
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