Things like making sure the diaphragm isn't damaged or pinched, the piston looks well lubed, and even hook it up to an air compressor to see if it holds boost. So its not much of a worry, but even if you go with the On3 wastegate, or a well known brand such as Tial. No boost creep or any problems with building or maintaining boost. The wastegate held up fine and didn't have any issues with it. Once I noticed it, I promptly removed the turbo. Enough shaft play that I can see where the blade made contact with the housing at one point. But after about ~20k miles, it developed shaft play. I ran the GT35 61mm turbo with my setup, and it spooled well, and I couldn't be any happier with it. The turbo and the wastegate are the parts most people are concerned about. I want to share my experience owning this kit for an extended time. Since most kits cost more than you paid for the car. So looking at a cost-effective kit such as the On 3 N54 single turbo kit looks a bit tempting. Through those years, the price of N54 335i's has tanked quite a lot. It's been about three years since I've had the On3 BMW N54 single turbo kit installed on my E90 335i.
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