Except when they don't, which is a lot.
Once again, if you use the search button, you can find dozens and dozens of posts about people needing to dent TTI's. They also give less ground clearance than Doug's.
All of these cars are a little different. Doug's fit some cars better, TTI's fit some cars better. It's not universal that either one of them fits best, it depends on your car, what engine mounts you have, which transmission, what size torsion bars, your choice of aftermarket parts, etc.
TTI's might fit your car better, which is great. But there are plenty of cars out there that Doug's fit better. Just the way it is.
