I have seen them all , holley or accufab are best quality , next would be Professional Products believe it or not ...but their idle screw sucks monkey balls (allen head bolt with a jam nut) loctite it if you use it .....if you get one of them I would advise going to a hardware store and find regular screw like the factory TB for it and use the stock spring off the factory TB ..they talk about Professional Products intakes having casting flash , well I owned one and it had some on the outside but was smooth on the inside, their TB is I would say perfect other than the idle screw if it wasnt with that I would rate it right beside the accufab in front of the holley....BBK which makes Edelbrocks looked like monkey metal....the BBK/edelbrock TB looked like someone chiseled the hole out for the idle air valve with a broken screwdriver ....Macs are ok but I have heard stores of them sticking open ...and thats not cool ......only complaint I have about the holley is the spring is very stiff so it makes the gas pedal feel like a brick but its cheaper than the accufab ......accufab makes some really nice stuff and you will hard pressed to find one bad word about them other than the price .....