Quote:
Originally Posted by darksparkz
Just to add to a slightly old thread.
I've thought about it, and that it's possible that Toyota purposefully designed it to create more pressure when the exhaust gases meet at the intersection, that way, they increase velocity in the pipes and control back pressure.
From a bit of searching: "EGR gasses to the cylinders can become unequal at lower gas flow rates (low speed & light load conditions) due to exhaust gas pulsations resulting from the unequal pipe lengths. This tuning via pipe restriction mentioned above, can directly improve EGR flow"
This problem exists in many V6 cars apparently, including the Maxima and Altima. I've emailed a few companys on whether they'd be willing to create a new mandrel bent y-pipe for us anyways though.
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I've been planning on this mod since last year, but decided on switching up the muffler instead... hopefully i'll be able to get to it this spring or summer.
and they are equal length, that's why they have a u-bend on one of the pipes before they meet, but yes, it's there to control back pressure
