As anyone who owns a P5 knows, the noise that comes from behind you is loud. Especially with a roof and windshield on, it just reverberates off of them. Another issue is with the heat that comes up between the seats and the seat belt latch area, just ride through a puddle with a hot engine and watch the steam roll in.
3 yrs ago when I got mine, the fix was to buy some foil backed carpet to put under the seat. It was like $38 for a 3' x 4' piece. Wasn't quite enough and didn't cover it entirely but it worked pretty good. The problem was that it was carpet in an off road machine, always wet, hard to clean and started to stink.
Had an idea to use commercial roof rubber instead, thin so it conforms but tough and doesn't break down. I've had it in for a couple of years now. It's works better than the carpet because it's heavier and I never take it out unless I need to get underneath. First time taking the seat out after a pressure wash, I found two little pockets where water had puddled, cut two little holes and it's always dry now.
Evidently this rubber is hard to find in small quantities and expensive. The cheapest I found online was $100 for a 10' x 10' sheet. Then you have to cut it which is a total PITA! I've cut 4 of them now, using each previous one as a gauge and it still sucks trying to get it perfect. Too many contours for it to lay perfectly flat but it's sealed up good.
I think I have a good enough pattern now and enough rubber to make a batch of these for sale if anyone is interested? It would be $70 shipped.
Here's what you'd be getting, less some of the cuts for snorkel and wiring...
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