LMP exhaust positions

[Try Hard]

Time for another techie question.

I have just looked at some more pics of the new luchini LMP2 car (over on DSC), taken at their first serious test with the car. I've noticed that it routes it's exhaust in an F1 style, out the top of the bodywork.

Now as I understand it, the F1 guys do this to reduce downforce sensitivity due to throttle position, as when the exhausts were running over/through the diffuser, the amount of generated downforce, whilst ultimately quite large, would vary with throttle position and the amount of exhaust gas flowing through.
This got me thinking on the various solutions to exhaust routing that seems to be taken by different LMP teams.

I have noticed that lots of LMP's still run there exhaust over the top of the diffuser, whilst some run them in other positions, like the Lister (into the channel in the rear wheel arch), and Courage (side exit in front of the rear wheel, at least with the Pug engine).

I'm just wondering whatr are the benifits/negatives of running such each different type.

Regards
Ed

[MulsanneMike]

There doesn't seem to be much to gain by exhaust placement. One suggestion regarding the Lucchini's placement is that the heat from the exhaust can play havoc on component reliability and removing its influence on the rear end of the car can hopefully reduce that. That is one of the primary reasons this is done in F1: you avoid the intricate exhaust pipe that has to then be routed delicately through the car, the heat from the exhaust then can't influence component relibility, and you can also waist the car in tighter at the rear.