[upgrading heated seats 300tdi]

I recently upgraded the front seats on my defender 300tdi to heated puma ones and was wondering if anyone had any advice on how easy it is to wire them in? The cold weather is coming and i'd like a toasty......!!

[weird turbo noise]

I can see this is an old post..... my 300tdi has exactly the same noise! Just wondering if you discovered what it was? Many people describe a whistle with a split pipe..... but it reminds me of a circular saw and not a whistle (more trumpet!)! Any help most gratefully received!