To reduce turbo noise, apparently at the cost of 0.05bhp . I could be wrong of course but a couple of guys on here (t0m & Coops) had back to back (I think) AMD dyno's with the same mods apart from Coops had a Forge Charge Pipe, t0m had an OE Charge Pipe. I think Coops made 305bhp & t0m made 301bhp but that's dyno figures which can be inaccurate at times & vary...so who know's . Personally I love the whine of the turbo so for a free DIY mod I'd have a go.
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