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Here is what is added/modified in the X51 kit:

- new intake manifold with modified cross-section (material: sand cast aluminium );

- new intake pipe supports adapted to the form of the intake manifold;

- new exhaust manifolds with larger cross-section and optimized flow behavior;

- new cylinder heads with optimized, CNC-milled inlet ducts;

- new camshafts with larger valve stroke on the inlet side and modified inlet and outlet timing;

- inlet valve springs adapted to the enlarged valve stroke;

- modified partition box in the oil pan;

- modified maps for the DME control module;

- new underside panel in the transmission area;

- all cars (except C4S) get a third radiator.

A PSE is a muffler which connects to the cats not the headers. So if the cats needed to change I'm sure they would have said so.

Installation varies from 2260 to 2620 (Porsche) TU. Most shops do a cylinder head exchange so you don't have to wait while they send your heads to Porsche for reworking.

100 Time Units is one hour. So 1 TU is 0.6 minutes, or 36 seconds.

I'll let you do the math... ;)

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