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I hate to necromance this old post, but it's the best one I found on the topic.
I'd like to add another point of data to it and share some notes from my install.
I have the M535 CU in my 2001 Boxster S, but my car wasn't optioned with the factory alarm system.
When I bought my car, it came with two keys, one that was just the back half of the key with the immobilizer pill, and the other one a complete key but with a non-functioning transmitter. Needless to say, every attempt at fixing that transmitter or re-establishing communication with the car failed. I punted and went with one of these $15 aftermarket systems.
I followed the instructions on page one of this thread, and I'm happy to report that on my car this works perfectly, even after extended time away from the car. My M535 (without the alarm) appears to not lock out the door locks function after a short period like some others reported here.
So I'd say if you don't have the factory alarm, this won't be a problem.
One more note is about the red wire with brown stripe. There are two wires in the forward bundle that look identical. I got the wrong one first, but no damage was done. Also, my alarm module came with a jumper I had to uninstall to make the unlock feature work.
I hooked up the indicators to the unit by the two wires on the rear plug, and that works perfectly. One blink of the marker lights for lock, two blinks for unlock. Range is better than my OEM systems on my two Lexus' (Lexuses? Lexi?)
I don't remember if I read it on here, but I did see a post that you could unbolt the seat and scoot it forward to make enough room without having to remove the seat from the car. That did work, but only after unclipping the wiring connector from the bottom of the seat. Don't unhook the harness, just unclip it from the bracket holding it in place.
I've only had this unit in place for a few days, but so far I'm pretty impressed with it, especially at the price point of lunch at Chick-fil-a.
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