i did the Hose 10
mod in a BE5 D 2001/12 with re-written ECU BOV Center pipe and Back pipe changed, i was running almost the same as without the mod with the difference of when hitting 4.000+ rpm the engine started to knock, so I reverted it again. But no idea why it was knocking too much boost? Vacuum leak?
i live in Japan and petrol is 96 to 100 Ron so I wouldn’t say it was caused by low quality petrol, and after i reverted it works totally fine solid boost all range and knocking is gone!
Shall i try the Hose #1 mod?
Cheers from Japan!