Depends on who you ask.................if you ask Vic Edelbrock you might have blisters in your ears! They are the reason all of his manifolds now have a big "Made in USA" sticker on them.

I'd say they would be fine for a street driven car, for higher demand engine app it's a personal call. They've apparently done very well in the knock off world, and have expanded their line of products to dampers, fuel filters and so on. They had an impressive display at SEMA.