irysfan

For street driving, go with the manufacturer's recommendation. If needed, -1-2 psi cold to see if you go any faster. -2-4 psi cold if you slide around a lot. +1-2 psi cold if you want better response. You want to stay within the recommended hot pressure range. Either way, it won't help too much on the street without driving excessively fast n the GT3 IMO. Adjusting tire pressure is a mean, among others, to the goal of getting tires to operate at the temperature range that maximizes traction, with consistent temperature across the tire. The general rule is to get the tires to reach the temperature of the side of the car that work the hardest, provided that side is not overheated. Tire pressure can alter cornering balance also, but it's generally better to adjust suspension / alignments for that.

Bridgestone yes, as long as they are N-rated. Prevailing knowledge seems to be the RE11 for dry/wet street and occasional track use. Do a search on Google for more opinions.

I have the GT3, the manual says 3.5 @ ~3-3.5k RPM, but it's always 5 @ 3-3.5k and 1.5 idle. No CEL, Engine Oil Level - checked. No leaks - checked. No problem - checked.

Just like surgery, don't do it if you don't have to for big operations like this. It'll never be the same.

I just got mine delivered from out of state from a Porsche dealer. Coincidentally, for the same reason - adaptive sports seat. 1. Deposit yes. Deposit first before PPI is a red flag. What are they hiding? The good news is that's a sign that the PPI won't check out perfect. Save your $ and take that elsewhere. Very risky. 2. Why would someone lease a car and not buy it? Well, likely people who go through cars and drive it like a rental, then dump it. It's the lessor's problem to find a sucker to buy it. If no one bites, for a variety of reasons, goes on auction. Also risky. 3. My out-of-state Porsche dealer used a guy who owns his company and delivers car. Great guy, nice trailer, and delivered my 997 in perfect condition. He spot flaws better than I could when he picked up the car, and I thought I'm picky enough to detail my own car. I found out he delivered Ferrari before and one of the cars (Mustang if I recall) in Fast & Furious. PM me if you need his contact. 4. No, but it's more stressful. If you find a good indy or a Porsche dealer do a PPI at their own shop where they have the right equipments, should be ok. My opinion is that a good indy and Porsche technician will do a better job than I when inspecting the vehicle. Just be sure they know what you needed them to evaluate beyond their standard checklist e.g. smoker car, creases in seats, etc. 5. Carfax blank ok, they don't catch everything. No service record for a >3 yr old car begs the question what the heck is going on? Slightly risky but if PPI checks out, it's probably fine. You may already know, 997 is known to have RMS leaks so watch out for chronic "leakers"...