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Treadstone shouldnt be in the China category. Ive used thier biggest model on a 1000whp twin 67 427 with good results. Got the job done. Ive also used Treadstones slightly smaller 6" tall core at 950whp with good results.
I used the treadstone 1000hp one this year, 8.32 at 171, less than 2psi drop, iats were iat(200+) though, but it works well enough for a cheaper intercooler.
Any idea what the pressure drop was though the IC you used on the TT 427 and what kind of temp rise did you see?
I dont have any hard data. We didnt log it since its a 100% street car. Looking at the IATs sometimes on a scan gauge we saw around a 60-80 degree rise on a 1/4 mile pull.