I think the 2 "ear" yellow-exhaust things are fine at the back of the head. But the middle one just seems out of place because it is crooked. But that's just imo.

Like take a look at Nova Prime's exhaust glows. 2 seems be enough. Idk, maybe it would be best to remove the middle exhaust-thing.

But if you do have to add something in the middle of the head, maybe you can add fins or special design at the back of the middle head? Something that is less intrusive