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Orbi has issues but is a great bit of kit i agree, BTB can't knock their reputation, unfortunately on the clio 182 system i have seen 2 now with cracked welds (majorly, not just a little bit)
Miltek i'm not even going to mention
Powerflow, depends on the bloke doing the work
Yozzasport...
the s1600 develops 220bhp from a 1.6 using a similar style inlet design
the 197 cup racer VLN car is doing 280bhp on a similar style manifold too
no ideas on peak, but speak to matt (icarus) he's the top dog race engineer!
tuners are so far behind motorsport sometimes!