Yes, you can have full Akra without rapid bike. There will be ABSOLUTELY no damage to the engine. Here's a dyno proof:
But if you want to get the most out of this wonderful exhaust (IMHO much better than Termi), I'd recommend RapidBike anyway
Thanks for sharing those charts. To say I'm surprised would be an understatement. In fact it's quite counter-intuitive.
What's interesting, but not surprising, is the difference the Rapidbike makes.
On that note, I have an RB EVO (from my previous Panigale) sitting on my bench which will be ported to my stock Multi 1260 following the first service.
I'll be disabling the exhaust valve upon its installation. I also have the Adori bypass adapter. The plan is to do "before and after" dyno runs to see the difference the RB does on a stock bike with and without the exhaust valve disabled.