I'm not sure about raw power gains from BCS system, but based on my limited research/understanding and a long chat with Nige from BCS (while my system was being fitted), it's one of the least restrictive systems available, with full 3" from turbo. Additionally, with the powervalve option, you get the benefit of more torque in the lower rpm range due to the extra backpressure caused by the closed exhaust valve when off boost. Then there's the very high quality build of these systems... Definitely hard to beat even if you factor in the price for a full system.
In any case, I guess that it's always about the overall set of modifications that have to complement each other, so a BCS system alone would not necessarily give more power than, say, a Miltek. Would be very interesting to see how both compare when paired with a good CAI, map and uprated HPFP! I wonder if anyone else is going to the April's AMD RR day with the above mods, but with a full Miltek system? Would be great to see the two side-by-side!
That's the understanding I got as well which is good to know .
I am actually getting a dyno done on Friday at austec racing and will be running loba hpfp , Miltek and amd Cai . Then after rolling road day I will be fitting the Bcs and swapping for revo Cai and going back to austec so I should be able to let you know how it differs this will be end April though
Further to the above - i did have a smoke test done ages ago and i did have a leak around the MAF - but AMD did replace the hosing. Im just very curious to see if there is any difference in the car with the revo on compared to the AMD
One other thing to consider with the BCS vs Miltek is the drone the Miltek creates, as well as the performance improvements, BCS pride themselves on having created something that sounds fantastic how ever the car is being driven.