Reading thru BryanF22 thread about CP's, post # 15 got my attention:-
http://www.2addicts.com/forums/showp...2&postcount=15
The stock inlet pipe - item 1 in the picture above - is common, to both PWG and EWG cars and it tapers to the stock PWG compressor wheel size. Great for PWG cars and despite EWG turbos having a larger compressor wheel, it appears BMW reused the same inlet pipe from old turbo.
To conclude then, for EWG cars, the connection at compressor housing is smaller than the compressor wheel. I had hoped the equivalent M2 part would be an OEM upgrade ie less / no tapering suited to larger inlet of the EWG turbo. Alas, M2 shares the same part.
I have read Pure hi flow inlet pipe is a canny upgrade as it opens up the diameter of the inlet pipe allows the EWG turbo to breathe more easily ie lower PWM values to achieve the same boost levels.
Any tips/go-bys on DIY install of Pure hi flow inlet pipe most welcome.
Thanks in advance,
BP