If you want to mock the Porsche and its 992, and stay how expensive it is (170K), you can always build up the the options list to set up your argument.  If I were configuring a very nicely optioned car, I would do it as below, which totals $135,120.  Then if you can't get a dealer to knock off 6% of that (then total of $127,000) you should find a new dealer. So, tell me where you can find a comparable high performance car for $127K? 

Gentian Blue Metallic

1A

$830

Interior Color

Leather Interior in Bordeaux Red

$3,830

Packages

Premium Package

$5,380

LED Headlights with Porsche Dynamic Light System Plus (PDLS+)

$0

Lane Keep Assist (LKA) incl. Traffic Sign Recognition

$0

Adaptive Cruise Control (ACC)

$0

Comfort Access

$0

Seat Ventilation

$0

BOSE® Surround Sound System

$0

Sport Package

$5,460

Sport Exhaust System with Tailpipes in Silver Porsche Exclusive Manufaktur

$0

Sport Chrono Package

$0

Porsche Active Suspension Management (PASM) (Lowered 10mm)

$0

Exterior

Power Folding Exterior Mirrors

$370

Performance

8-speed Porsche Doppelkupplung (PDK)

$0

Wheels

20"/21" Carrera S Wheels

$0

Wheel Accessories

Wheel Center Caps with Colored Porsche Crest

$190

Lights and Vision

Comfort and Assistance Systems

Interior

Power Sport Seats (14-way) with Memory Package

$2,330

Steering Wheel Heating

$280

Interior Carbon Fiber

Interior Trim in Carbon Fiber

$2,100

Audio and Communication

Total Price*

$135,120