Saab 9-3 muffler and tip, heavy duty clutch and pressure plate, stiffened and lowered springs, firmer dampers, as well as stronger CV joints and driveshafts. In 1999, the Viggen was the first 9-3 to use Saab's Trionic 7 engine management system. The 2001 model year introduced a Traction Control System (TCS). The TCS was later made available in the SE line. The car featured a rear wing that required relocating the radio antenna, aerodynamically designed bumpers and side skirts, special bolstered and colored leather seats (in four colors: black with black inserts (charcoal), black with blue inserts (deep blue), black with orange
Order-7-3 triangular honeycomb arrangement. It has a second construction as a uniform honeycomb, Schläfli symbol {6,(7,3,7)}, Coxeter diagram, , with alternating types or colors of cells. In Coxeter notation the half symmetry is [6,7,6,1] = [6,((7,3,7))]. In the geometry of hyperbolic 3-space, the order-7-infinite apeirogonal honeycomb (or ∞,7,∞ honeycomb) is a regular space-filling tessellation (or honeycomb) with Schläfli symbol {∞,7,∞}. It has infinitely many order-7 apeirogonal tiling {∞,7} around each edge. All vertices are ultra-ideal (existing beyond the ideal boundary) with infinitely many order-7 apeirogonal tilings existing around each vertex in an infinite-order heptagonal tiling vertex figure. It has a second construction as