ISIS is hit or miss. If you buy from Enjuku, Ken stands behind everything they sell.
I'm not a big fan of knock-offs because I think they stifle innovation and eventually kill the performance market for their intended target. That said, they have a place when companies stop making a product or you just need something simple and cheap as a temporary solution. When you modify a car with good quality products, chances are it's going to cost a lot of money.
Would I try an ISIS product with moving parts or electronics? Nope. Would I try a racing intake or diversion panel (no idea if they make it) that is basically a hunk of metal? Sure. I have one of the very first production runs of the ISIS S13 SR20DET racing intakes and it's held up fine for years.
Bottom line: Shop at a good ISIS retailer so if you have problems, they will replace it. Use the proceeds from selling the replacement or the store credit to save toward a name brand
