The Gruppe M is good, but the cost is a joke at the moment due to the poor Yen to Pound rate. It is an amazing bit of kit, and that huge lump of Carbon Blingy under the bonnet looks great, my mate used to say it sounds like Dart Vader with Asthma:lol: The AEM is also a great piece of kit if you don't want to spend out the cash. Hydrolock is VERY VERY rare, i think i have seen two incidents of it on the yank EP forums, and that was idiots who tried to cross Fords in their car, so their own fault really. Like i say, i have driven in some awful weather and never seen an issue. Gunn who used to come on here was in the same situation as me, Devon, mud, rain, cow sh@t, dirty lanes and deep puddles. He took his cone off to clean, and it was surprisingly not too bad. The wheel plastics do stop a lot of crap from getting in to the filter area. I would recomend both systems for power gains, but if you don't have the cash, the AEM is easily the winner, just for downright value