I think the red ties the look of the car together. With all black you'd lose the lines and shape of the car and it'd look like every other blacked out car riding around. It could easily go the wrong way with to much red like I've seen people here doing, like putting red stripes in any crack they can find, but you did it right, not to much but enough to show some contrast and draw attention.
I like it... a lot! I though would prefer a gloss red on the accents to make them pop more, I think the gloss would bring it together fully for me, but I do like the contrast as someone above mentioned, looks mean! Everything looks nicely thought out and I like it