Cheap mod chip... hmm not sure ?
 

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2442399211&category=10 408

Looks very suspect to me. Can anyone verify if this is possible or just bollox..

Re: Cheap mod chip... hmm not sure ?
 

I think I'd be inclined to take it with a pinch of bollocks (ouch!).

I'm not sufficiently au fai (s'cuse my French) with chipped injection mods myself (I'm a bucket for a carb and huge cubes to pour it down man myself) but I'd be very much surprised if Porsche had left some 20 HP carelessly lying around for some Johnny come lately to 'find' with his box of magic beans. I can just about imagine releasing a little extra from a US import (I believe they're slightly detuned to cope with strict US emission laws) but 20 HP ??? from a Brit motor??? He's having a laugh. You'd be lucky to pull that out of the hat with serious valve work, porting, lightened rods, boring out and expensive injection system upgrades, better breathing and tuned exhaust.

If his chip works he'd be marking it up nearer his competition, say, $50 less to undercut them. He's not. Draw your own conclusions.

The anonymous yahoo contact address shrieks dodgy too.

I would guess its a resistor mod. Which is intended to make your DME think the air or engine temp is colder than it actually is. Usually richening the fuel mixture slightly.