Astor XS XU7J4RS (For Sale £1000)

[Dan86]

I don't think I would be too far wrong to say that each manifold has been optimized for each engine and each ecu mapped to suit meaning that mixing parts without a remap would then mean that the engine is not optimized and would produce less power.
Also 98hp is only a reduction of 12.5% (hope my maths is good) over standard; quite feasable for an engine which is either over fuelling or under fuelling caused by mismatched components.