Hi guys had my octavia about 3m now but I have had a boost problem when I get to 3k revs n put foot to floor the boost drops off and kicks back in about 4K revs I have changed the dv, crankcase breather pipes and n75 any ideas please

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Get it scanned, not all faults throw a code. Get a smoke test for leaks in the charge line. Could also try the MAF unplugged, if it doesn't do it then the MAF is playing up.

Also doesn't hurt to check basics, air filter, pipe connections etc. A few mysterious problems on here lately have been solved in surprisingly simple ways.

Had it scanned all fault codes clear

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Sorry I meant throw an EML but anyway they're clear? Try the other suggestions. I seem to remember someone having a similar issue that was a leak from cooler to throttle body which leaked from initial surge so boost faded, but as charge built up again boost came back on.