When the kittyhawk came out I remember needing to fine tune the red glow and blue flame locations to get the combined look just right.
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="0.55" PosZ="1.5" PosY="0.3"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="0.55" PosZ="1.25" PosY="0.3"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="0.55" PosZ="1.0" PosY="0.3"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="-0.55" PosZ="1.5" PosY="0.3"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="-0.55" PosZ="1.25" PosY="0.3"/>
<Effect Type="Track" EffectName="fighter_exhaust_blue_flame" PosX="-0.55" PosZ="1.0" PosY="0.3"/>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.65" PosZ="0.97" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.645" PosZ="1.14" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.64" PosZ="1.31" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.635" PosZ="1.48" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.63" PosZ="1.65" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="0.625" PosZ="1.82" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.65" PosZ="0.97" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.645" PosZ="1.14" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.64" PosZ="1.31" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.635" PosZ="1.48" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.63" PosZ="1.65" PosY="0.28" MinVel="50" MaxVel="300"></Effect>
<Effect Type="Track" EffectName="ac_exhaust_glow" PosX="-0.625" PosZ="1.82" PosY="0.28" MinVel="50" MaxVel="300"></Effect>