Do exhaust sounds or muffler sounds sound different on camera?

I have a iPhone 5s and I'm recording my new muffler exhaust on my accord. On person it sounds good. Deep and really nice. I had my girl rev it and it sounded nice, but when I record a video I can't hear the deepness on camera just the exhaust sound and it doesn't sound that nice! So which one is the real sound? Do videos really not capture the exact sound!

Of course they do. An I-phone camera just has a cheap little microphone and a couple of extremely small speakers. It does not have the ability to reproduce sounds like a good quality stereo system could.