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Inlet Manifold and Cold Air Intake | by Marlin BMW Cabrio
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Inlet Manifold and Cold Air Intake

Fitting an M50 is tight in a Cabrio. Even after cutting 75mm out of the manifold there is still little room for the elbow. The donor fitting of the elbow has it facing forward, which in the Cabrio does not work due to the very narrow bonnet. Rotating it 180 degrees left me fighting the two return ports which then pointed upwards, fouling on the bonnet top.

 

I then came across Jeremy's solution of fitting the elbow back to front. By cutting off the leading 15mm flange which normally fits to the MAF, the elbow can be made to fit the throttle body, allowing the elbow to face rearwards where the bonnet is wider: this also allows the two side ports to face down: the rest then drops in to place.

 

I did not want the induction hissing which comes with an exposed filter, so have fitted a K&N Apollo Induction filter. There is just enough space, using 70mm flexible hosing, to pipe the inlet back to the nose cone cowl to ensure the intake only feeds cool air in to the engine. It's all quite tight, but it works.

 

Edit

Best of all, by further eliminating the bellows at the throttlebody end it releases sufficient width to fit the original M50 Inlet manifold without modification. - see later.

 

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Taken on October 9, 2011