How do I get exhaust flame?

[ATAG_Snapper]

Originally Posted by jamesdietz

I've noticed in a few of the vids that the planes have exhaust flames during flight ...how? I have visual effects & model detail turned up to high , but no joy.Is my PC automatically limited or do I need to turn another option up? It looks nifty, but does it also effect FPS?

As Ailantd said above, only with CEM. It DOES look nifty but the exhaust flames are also useful, using CEM, to adjust your throttle (boost), propellor pitch (engine rpm), and mixture settings.

Blue flames = good
Yellow flames = bad