I've gotten the go ahead from the Mrs. (it's her car anyway) to get the ECU GIAC flashed on her 958 CTT. Would it be recommended to upgrade the intercoolers as well? Any detriment to the harder working turbos if I do not? This is not a track car and she mostly drives it until I inherit the truck in a couple of years.


Thanks.

 

From other members who have tuned their Cayennes, they almost all recommend upgrading the stock plenum and diverter valves. The stock valves are are plastic and are susceptible to cracking from the increased boost from the tune.

I recently did both of these upgrades, check out this thread for some pics.

 

You'll be perfectly fine with stock intercoolers. As noted, the plenum does make a nice torque gain in the mid range.

 

HOiYA,
Is replacing the IPD Plenum in the Turbo S an easy and straight forward DIY?

 

The plenum is an easy install on the Cayenne Turbo. For the intercoolers, I would say 90% of customers stick with the stock intercoolers. I would recommend looking at exhaust before intercoolers, if you are interested in even more power. Most customers are very happy with the power jump from the software alone

 

Here is a link to a DIY thread.

 

awesome! Thank you!

 

I agree about the exhaust and improved air intake to go along with the tune as I have done that with my ctsV.