I have one of the 'original' Donny pipes..... and it helps make the turbo a little more responsive - but realisitcally doesn't make a whole host of difference.
If you are not going beyond injectors and remap i would save the cash unless you want the bling in the engine bay 
You can probably get the same gains by unsquashing the OE one in a vice lol
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Mods Fitted
Pipercross Filter; Full 2.5" 'Wingy' exhaust; Donny Custom Turbo outlet pipe; Custom injectors;
Uprated gearbox bearings; Helix Clutch; Quaife ATB; Upgraded clutch Hydraulics; FMIC; Ported Head; ARP headstuds; Leda coilovers; 'Brembodge' 326mm disks/DS2500 pads
Dieselpowered
Fitting Custom Hybrid Turbo (1856GTBv) & controller; Remap, swirlpot, lift pump
AMW Motorsports
Custom exhaust manifold & downpipe
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