Hardtop here also, and you know I actually bought this car because it was heavey, (safe in T bones, rear ends, and head ons), rear wheel drive, and an inline twin overhead cam 6, so if you think it isn't fast enough in stock trim, make more horepower, I would not cheapen the awesome luxury and safety the car has built it. Our cars handle awesome with sway bars alone, let alone strap on some sticky fat tires. Thats just my opinion though.