What are you trying to achieve with the larger maf? You can't just change the maf and away you go, it requires being written into the tune.
As for the TIP, I'm just about finished up a few custom 3" TIP for a few 9n3 polo guys. One of them being Dan (pazuzzu) from here. It's the same as what, Sean Gav and I run which require an elbow to connect onto the turbo.
Generally speaking, people only go for these when going for a custom intake system like we all run and when doing the 3" maf and turbo swap to utilise it properly, but I'm happy to make them up for others wanting it for stage 2 as well.
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