i have hooker competion on my car 1 5/8.
passenger side fits great.
drivers sides is another store the ground clearance is horriable about 2 1/2 to 3 inchs below the k-frame. The tubes on top run directly across the last to plugs 5 and 7. makes for getting the right wire ends interesting.
clears power steering by a mile.
TTi i have seen on other challengers look to be a much better fit but like said alot of money.
Dougs headers i was looking at on a challenger look to the naked eye alot better of a fit.