I think its a bit loud for std iPhone recording man, to get a proper gauge of it, with how low and deep the rumble is, may need to buy some sort of recording device that can handle it, lol an maybe a microphone with one of those woolie covers to handle all that airflow...
I have heard it first hand, an all i can say is... tough... and with a lil rev, that car will be instilling nightmares into children that will last them the rest of eternity, not only destroying their inner soul but feeding them to the devil..... Yup, thats what it sounds like, feeding children to the devil...
So yeah, long story short... tough... haha