mamba turbo.

If your going for 2871r or 3071r you really need to upgrade the bearing carrier when ordering it. Prices start to mount up but it's defo needed.

I'd 100% go for 3071r over 2871r. It's just a better turbo, the extra torque from the 3071r makes it a better car in my opinion.

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After looking at these photos I don't think its been polished. But can you clarify it is ported from the those pictures. I think the lad has done the work himself. Im actually quite worried by what I'm looking. although these are photos of the job in progress. and to be honest I don't know exactly what I'm looking for.

intake don't want to be polished as slight rough surface texture helps fuel air mix . don't want remove to much material either really, exhaust side is where gains can be had easier . Good blueprint of manifolds is a must. Porting is an art form when done real well & needs good experience & flow bench .
I would not touch chinese turbos, seen plenty of the junk in thailand :-D these probably better than some but still under perform & you got fook all warranty plus you looking at potential £100plus import tax bill.
only thing I buy chinese is springrolls, roast duck, prawn crackers & cheap phone repair parts lol .
I'm a big fan of GTX28 & 29 series turbos, if aiming around 400hp you don't need go up to 30 series, GTX28 series can do 500hp easily but real trick spec is indeed big money.
I would hunt around and see what you can get new or used or upgraded from what you already got .
Other option for budget conscious is picking up an evo turbo used as these can be had cheap and build a custom steel manifold from buttweld fittings (steam-pipe) .

Lols. Thanks Mr b will stick with crispy duck also.
OK this gives to something to research.

@Mr B wrote:
only thing I buy chinese is springrolls, roast duck, prawn crackers & cheap phone repair parts lol .

@Mr B wrote:
Other option for budget conscious is picking up an evo turbo used as these can be had cheap and build a custom steel manifold from buttweld fittings (steam-pipe) .

What are butt weld fittings Mr B? Might be a new winter project for me

This sort of thing >

You can buy them in various diameters and bend radius, bit of cutting and imagination creates all sorts .
If Google the key words you'll get loads of info and see some amazing manifolds made from them.
I used steel as easy weld./work neat and I'm no pro welder plus it has durability and cost advantages over stainless and you can ceramic coat a worthwhile artwork piece for pro finish .
turbinetech did a mitsi 16g-20g manifold for the R ...