T3 FULL coil over system (front and rear), who is using them

[4000GT]

The equipment is constant. Its not like they use one set of tools for one job, and another set that delivers a different quality for another. Its about the engineering design and materials and tolerances. Here is a scenario in a plant in China I worked in setting up a rubber goods manufacturer. There are certain tolerances on the thickness of a butyl cladding. The machinery is constant but there are variances depending on the ambient temps (and other factors) which effects the curing rates and gauge of the cladding. The stock which was at a very high accuracy in gauge tolerance was branded X and went to architects for high end construction, the sections which were of variable gauge were branded Y and went to the domestic construction market. In this case, the product was not even specified differently, it just naturally worked out that way.

A manufacturer produces tolerances that are fit for purpose. Ergo the entry level low grade shock, does not have or require the same tolerances as the high end race shock. Its about the quality control process...

In the TRD versus KYB, we are also saying there are likely design and material differences. It is also EXTREMELY likely that TRD own the IP of that configuration and the manufacturer would be prohibited from delivering that good (again for very obvious reasons) to the market. Else all TRD's specification to the specific model would be useless.

By SPC I assume you mean statistical process control? If so, yes, contract manufactured goods would likely be tested to a range of variances. They would also look at CPK indices in the first instance too. I lecture SPC at the local University