Sorry for the late reply.......but at least Ive been racing !
(Even instructed Steve McQueens son a bit!)
1) Our sills are VERY inexpensive, and easy to customize. They are less than half the price of some on the web. Under $350/pr!
2) We WILL have them in C-Fibre soon, will be nearer $995/pr
3) We cannot know where to drill the right-angle slots, so we default to forward-aft adjustment. Since they pop on/off in just minutes, once you have the fore-aft set, you can make a slot at right angles and adjust inward/outward. THEN finish the piece.
4) Benefits include REAL aero-improvements: more downforce due to less lift; Less flow into rear wheelwells, and less lift/drag there; Rock-chip sill protection; harder to "kick / scuff" the sidesills; and lastly....if you ever high center on a curb, or off-track, your $2599 -$4000 OE aluminum sidesills are PROTECTED ! Hard to CURB them at all! {Special thanks to Frank Parise and Tony - again! Special note to Cstegall: CLARK! Once you paint em yeller you'll love 'em! In fact, I hear you may have Yeller Fever?! }