I noticed a part missing on mine as well. One of the pipes on the exhaust manifolds. I found it odd that those were not one piece like most aircraft especially since they are not hollow. I sent Eduard an email last night about 10PM and they had replied before I woke up this morning saying that they are sending a free replacement. So for, I've been nothing but impressed with them.
I've contemplated ordering the Quickboost resin exhaust from Squadron. They look really nice and worth every bit of 6 bucks if it keeps me from having to glue on and drill out 24 individual pipes. Yikes!