[mwebb]

Originally Posted by Daox

The converter is halfway down the car. I'd have to run some fairly long piping. If it were simply off the manifold as most newer cars are I'd agree that would be a better option. Also, if the

EGR is bypassing the throttle and there is a small amount of O2 in it,

thats not a problem and might even be a good thing as I can actually use that to lower pumping losses even further by using more EGR.

exhaust gases before the cat are going to have 1% or more 02 and measurable amounts of CO and HC .
that constitutes air fuel mixture , albeit in very small amounts .

intake air temp sensor would see increased temperature from EGR .
due to the extra heat ,
i do not think it would be a good idea to add EGR before the throttle body , no current car manufacturer does that , that i know of
and
some like GM 3800 s have heat related failures / problems related to EGR flow in the intake manifold .

Cool ed EGR gases from downstream would help to resolve heat related problems