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#9
10-16-2017, 04:21 PM
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The 4.6iS has unequal diameter headers. The drivers side cat tubing is 55mm in diameter while the passenger side is 50mm. The 55mm carries all the way to the silencer, it necks down at the silencer opening. The 4.4 is 50mm both sides.
I have never heard a definitive reason why, but assume it is to balance pressure drop due more bends and length on the drivers side.
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A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams  2003 X5 4.6is Estoril Blue 2005 Infiniti G35X 1972 Datsun 240Z 1991 Isuzu Impulse XS Sold 1972 Fiat 850 Spyder Donated 1972 Datsun 240Z Sold 1972 Datsun 510 Sold 
Last edited by jcp240z; 10-17-2017 at 01:17 AM. 
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