The 6601 is listed for 1970-1972 Maverick/Comet with 170/200, is compatible with power steering, column or floor shifted manual or automatic transmission. Primary tubes are 38" long and 1.5" diameter with a 2.5" diameter collector 8" long.
The 6601 is also listed for 1965-1970 Mustang Cougar with 170/200, is compatible with power steering and power brakes, floor shifted manual or automatic transmission. Tubes are the same as above.
I just noticed the 6602 is also listed for 1969-1971 Mustang/Cougar with 250, is compatible with power steering, floor shifted manual or automatic transmission. Tubes are the same as previous post.
Darrell