hey, you will not know until you go out and do it...weather conditions, road conditions, tires, the seat of your pants can all affect a top speed run...and I didn't mention birds, dogs, rabbits, deer either. So, just do it in a safe place...there are a lot of factors to cut down your top end, but it needs to breath, and needs HP to get up there to begin with. Mine was beginning to slow at 160...so the next 20 could take awhile....I still think you will need at least 3 miles to get there and good brakes to bring down before you run out of road...so be safe...would've could've doesn't count here...**** was fllying by at 160...good luck to all...