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Levels Performance has an Explorer ST intercooler on the market. I bought it new from a local enthusiast who decided to sell his. I don’t want to bad mouth the company but they’ve had some issues. I’ll defer to your research.
I have the HKS SSQV4 and I do like it but I wish I would have went turbo smart or the TIAL. The TIAL sounds awesome to me but the HKS that I remember in the past on certain vehicles doesn't sound the same to me now.
I ended up going HKS. I'll take the whistling fin out and install the purple low frequency fin. It sounds very similar to the Turbosmart with the purple insert. I liked the HKS design and marketing slightly more than the TS. Probably can't go wrong with any of the choices. I may find a way to recirculate it after a while if I find the hiss too intrusive. Do you find the noise annoying?