heh, I have the same helmet as your passenger... HJC carbon. Really, I have 3 of them. 1 smashed the back in when I got rear ended on the interstate, one saved my face when I faceplanted after being hit by a drunk, and the 3rd one I bought as a replacement for the other two. good helmet. as far as your intercooler goes, I have to re-read your thread, to remember witch 818 this is (I try to read all the build threads, so I get them confused) but dont forget the other side of the air cooler. If you put an exit duct into a low pressure area, it will draw more air through it... although to be honest, I think this car really needs an air to water intercooler... rear engined cars can be finicky about airflow around the motor...