i see several things wrong with this question, let's start with the title, which Honda? limited to what aftermarket parts? what Mustang V-12? i've never heard of one. the last question is the one i find most relevant.
next, let's turn to the paragraph following your question: what does 5.0 miles per gallon have to do with anything? relevance factor 0. and last but not least, the 650 mph claim. last i checked the Bugatti Veyron still held the record for fastest factory produced vehicle, and that is at 253 mph, you're more than doubling that claim... so let's recap, you need to be more specific, do more research, and put faith in realistic sources, because other than "honda" there hasn't been a kernel of truth to anything you've said
next, let's turn to the paragraph following your question: what does 5.0 miles per gallon have to do with anything? relevance factor 0. and last but not least, the 650 mph claim. last i checked the Bugatti Veyron still held the record for fastest factory produced vehicle, and that is at 253 mph, you're more than doubling that claim... so let's recap, you need to be more specific, do more research, and put faith in realistic sources, because other than "honda" there hasn't been a kernel of truth to anything you've said