How are the stock 914 seats for those of us that are not exactly skinny? Im 5'9" 235lbs. 40 inch waist.

Stock seats are fine for bigger guys like us. They do not reallly have side bolsters. Almost flat and with the center cushon it can almost be a bench seat. I had high bolster racing seats before. My wife hates them. She has girly hips and don't fit. No worries, you will fit comfy in a stock seat.

Here's a pic not great but you can see how low the side bolster is.

Click to view attachment

Thanks, that's what I wanted to hear.

I am exactly those measurements and have no problem. I dailly drive mine in nice weather.