Look all I'm asking for legitimate proof of how great your dump pipe is, because I have 3 cars that have proved split dumps are not as good as bell mouth(not including all the xr6t boys who take them off and go to bell mouth design)
But another thing to add your your 1.06 argument is I have a mate with a momo steering wheel that has done sub 1 min around Wakefield and he thinks it feels great, does that make the momo a more cost effective mod then your dump pipe?