We did not add a extra thread for engines and trannys, because engine and tranny questions should be involved in the tech threads. If we added a Engine and Tranny thread, no one would even post questions in the GTV, Spider, etc sections.
We also thought about Car Audio. I forget who, but someone has a signature that says "who needs a radio at 5500 rpm".
If it becomes a demand we will definitly add a car audio, but right now we need more Q&A in the tech boards.
Body Work/ Dress up/ style is a good idea, but I think body work and dress up style can be asked and anwsered in the tech threads.