On You Tube if you search BBR200 you will come across a vid of Neil doing a 0 to 60 in 6 seconds. I reckon that’s about right. If you want the extra power then it’s a worthwhile upgrade, especially if you intend to keep the car. At times in the right gear I find the car genuinely quite fast. Mine was done in feb last year and no issues so far.
my plan was to keep it as long as it will run. I only picked it up last year, my other runner is a bmw 1 series but the mx5 is my daily, the beamer is my driver when the mx5 is being worked on. it has 62k miles on it and im thinking the upgrade will keep it fun until i am forced into ev world.