does anybody know if this will cause a dirt buildup in between the apr wind splitter and the bottom of ur bumper since there is not a seal there...I just am curious if dirt will clog up inbetween the two...and also does anybody know how far back this splitter goes? And can u use it in place of a undertray

 

Yes, this splitter will collect some dirt, dust, bugs, etc; not much really. I don't take my car off-road though. It replaces your your plastic undertray, you won't re-use it with the splitter on. The splitter ends at your wheel-well and projects straight across to your other wheel-well, so if you take a piece of string from wheel-well to wheel-well that will be where your splitter will sit. Peace.