Of those two I would go with the RB BXR for one reason only. The exhaust port on Picco race .21's blocks are angled slightly downward which means you should use only Picco headers. Have alook at this pic I nicked from A Main:
picco boost 2013.JPG [ 31.89 KiB | Viewed 5892 times ]
That is unless you are willing to bend an existing header to fit which really is no biggie.
RB blocks have a 'standard' exhaust port which is parallel with the crankshaft centre line which means a much wider range of pipes will fit.
Power-wise, both engines are BANDITS! And both are high quality engines. But the Picco's exhaust angle is something one should be aware of when looking at these engines.
Regards,
Speed Metal
