I purchased my 07 Roush 427R from Frontier Ford. The Internet Manager at that time is one of the owners of this company. His name is Mike Mak and is a dedicated Mustang owner, organizer and businessman.
He sponsors car shows and charitable events in the Bay Area and has a very good reputation. I'm sure he will stand behind this product.
He was a pleasure to work with from a sales point of view, very honest and informative and I was able to drive a Mustang GT Regency, Foose Mustang and several Roush Mustangs before finally settling on my 427R.
I'm sure he can answer any questions you might have.