I always play with ideas and was wondering about undertrays for fc's but my questions are general.

Is there any side affects for a full flat undertray? example diff getting to hot?

Is a rear diffuser hard to custom make, are they tested for aerodynamics?

 

Heat is the biggest barrier to doing this. If you like, call me, on the weekend, and i will discuss my plans for my splitter/flat bottom/diffuser. Carl 707-696-2705