Unlikely to fit mate. The shape of the muffler is wrong, the pipe entering the muffler is at the wrong angle, so the muffler itself will likely require massive amounts of modifications.
Much easier to fit a GTI muffler, will be a straight fit with no issues.
FYI, I held up my R muffler under the TSI (which has the same layout as the TDI and the GTI) and just too much work needed (at $$$$) so went with a GTI muffler on the TSI with no issues at all.
If you want quad tips, look for an Oettinger quad tip muffler for a GTI (Mk7.5). I did have 1 of those but it was for a MK7 only and did not fit a MK7.5.
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