....I bought my 550 SE on purpose. It's THE Porsche that I wanted to own.
I found a bone stock one with only 25,000 miles on her in 2015.
I replaced the muffler, but kept the original and the original SE tip.
I replaced all of the interior, frunk, trunk, license plate, and front side marker lights with LEDs.
I bolted Porsche and PCA car badges to the roll hoop screens.
I bolted clear lexan wind blockers to those same roll hoop screens.
I installed a Bird Automotive center console.
I installed a thicker rimmed, flat bottom steering wheel that matched the Cocoa Brown leather and used the factory air bag.
I installed the Rennline rear brace and all four under car tie down hooks and the jack pad on the aluminum arch.
I installed the black stick on covers over the sun visor warning stickers.
I removed the warning stickers in the forward door jam.
I bought eBay leather covers for the flip up arm rest lids.
I bought leather covers for the black plastic bit at the top of the door handles from Pedro.
I installed an articulated cell phone holder that bolts to the seat rail and sticks up and can be located in different positions to hold my cell phone.
I installed a waterproof box around the immobilizer computer under the driver's seat.
I, like you, do NOT want an aftermarket radio.
I installed this:
https://www.bumperplugs.com/index.php?route=product/product&path=2_22_176&product_id=254
And this allows me to get GPS maps, Pandora, XM/Sirius, iPod, I Heart Radio, movies, TV shows, all of it, played through my stereo, with hands free calling, hands free texting, hands free email, all with Siri voice control through my iPhone.
All while keeping the factory radio.
Add this:
https://pearlauto.com/rearvision
And you get a backup camera in your car without cutting into your collector car.
Welcome to the party.
All the best!