While collectively they may add up to "good money", when you look at each part singularly against the available alternative brands, every part you bought is the cheapest derivative. This leads to terrible performance that SZ didn't want to take the risk of being liable for tuning. Please do some research on those injectors, AMS, and atmosphere-vented BOV's on a MAF-tuned engine such as our VG30DETT. Each subject has been covered ad naseum; you just need to take the time to look it up.