Has anybody fitted this manifold, does anybody know how much difference they make from stock.
http://www.thsperformance.co.uk/product/1.8T_High_Flow_Transverse_Manifold_THSCMA-18T-TV
http://www.thsperformance.co.uk/product/1.8T_High_Flow_Transverse_Manifold_THSCMA-18T-TV