Wouldn't do it personally, its not just metal quality, its also weld and build quality
Bad welds and bad engineering is going to affect performance and lifetime of the part

The reason you pay more for a milltek is the name.... they are known to know what they are doing, they will be designed much better
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold