I received my exhaust first and ran it, and then did the Brockflash F1 a couple of weeks later. Performance AND looks are both simply awesome!! My Z900RS is like a different machine in a very good way. The other thing is the service and speed of Brock’s was second to none and I couldn’t recommend a better to do business with. Mike Rogers

PIPE INSTALLED ON NEW 2018 BIKE. SOUNDS GREAT LIKE OLD YOSHI ON MY 74 Z. THE ECU WAS SENT ON A MONDAY AND RETURNED BY THE FIRST OF THE NEXT WEEK. HAVE RIDDEN A LITTLE SO FAR AND SEEMS TO LIVE UP TO PROMISE. THROTTLE SEEMS TO BE SMOTHER.

Very happy with this flash. It works exactly as advertised... completely cured the engine braking problem, improved slow speed riding immensely, and added a substantial amount of power on the big end, when used with Brock’s exhaust and intake accessories. I enjoyed my bike before, but now it is fantastic! Thank you Brock’s for a fantastic product!

To me, this is the crucial centerpiece of the Stock to Brock's package! The reflash allows the bike to work at it's best with the new added parts. The tuning changes make this a whole new motorcycle! Stronger pull throughout the rev range that continues all the way to the red. The power no longer fizzles out, just keeps building steam until you have to shift it. Amazing night and day difference! The on/off throttle transitions were smoothed out dramatically on my bike and it now feels like you're riding with a very well tuned set of CV carbs that continue to meter fuel when the throttle is closed. No more jerkiness when transitioning in the middle of a curve and engine braking is reduced a bit. This also allows smoother shifting, as in this thing shifts like butter now quickly and easily! With the PAIR blocked and O2 sensor removed as instructed, there is no popping on decel with the Streemeg exhaust. Everything just WORKS together now to make this feel like a perfectly tuned streetbike. Another nice feature I noticed right away was that the traction control mode selection is retained when the ignition key is cycled. Nice touch! If you stop for a break while riding in the rain on level 2, it will remain on 2 when restarted. If you're in the mood for hooligan shenanigans involving wheelies or burnouts, the traction control will remain off until you are ready to turn it back on. I just spent an afternoon romping around on the RS with the new setup, and couldn't be happier about how it runs.

I wanted to maximize the performance of the motor and initially purchased and installed the full Street Meg exhaust before Brocks released the “S2B Performance Package”. I knew I wanted to purchase the ECU Flash with Fuel tune to complement the exhaust. So, with just the exhaust I found the midrange and top end rpm performance to be phenomenal. I then received the ECU the velocity stacks and the Sprint Filter and installed them. The performance gains from these components combined is nothing short of amazing. The dyno graph on Brocks site is impressive but to feel the performance gains is something entirely different. The bike’s motor performs well but is docile, with the “S2B Performance Package” it is a completely different motor, might I even say aggressive. Aggressive in a good way, the drivability is still good though the throttle response is instant and requires re-calibrating your right hand to adapt to the new instant acceleration. So how to describe the increase in performance? The low end is as strong if not stronger than stock, throttle response is instantaneous, the midrange is quite a bit stronger and now the motor just revs freer all the way to red line. The top end pull is so strong and fast you must pay attention to the rpms or you will hit the rev limiter before you know it. Absolutely incredible Mr. Brock, now the motor’s performance matches the looks of this incredible motorcycle.