My 3rd ZX12R had a full race Akrapovic system, K&N filter and powercommander. WOOOW
It made the standard bike feel like a Blackbird and it did not effect fuel economy.
That’s a beauty
My first 12R. Yoshi can, K&N, PC3 = 178bhp on Tim Blakemore's Dyno.

it was a rocket that bike. alas, i wrote it off on a track day at Castle Combe.

. Thats about £161 + carrage = good saving. However been in contact with Dynojet and they say the PCV will work on the GS1200 and its price is £313. At the moment I don't know enough to decide between the 2.