Thank you for pointing out that Ehresmann uses Cargraphic parts.
I've only heard good things about Ehresmann on this forum, so that makes me feel even better for choosing Cargraphic. If I lived in Europe in lieu of North America, I would definitely take my 718 to Ehresmann asap.
I will be in contact with the installation shop next week and will inquire about a before & after dyno test and any associated cost. The shop doing the install builds racing Caymans, so I think they should be able to offer me a dyno.
I agree with you that I will need a tune to get the full potential from this Cargraphic exhaust system upgrade.
However, I plan to wait another 12-18 months before I perform an ECU tune. I'm driving about 15,000 miles per year with the 718, so waiting 12-18 months should put me pretty close to the end of the warranty period.
Also, I need to spend more time investigating the different tuning companies/options and determine which route to take.
More tuning options for the 718 could arise over the next 12-18 months as well.
I would like to find the closest thing I can to Ehresmann here in the USA. Right now, COBB is probably the front runner for my business. Especially, if they release a "front door flash" system.
Anyways, I'll create a photo album and post an update after the Cargraphic install next month.