chips are useless if you have a tuner,,, i would go with Rc engineering 550's and zeitronix wideband, just as a side note, you may want to consider packing your foundation before putting a shopping mall on it, if you get my drift,,,,,,
oddly enough the only supra out of the four that ive owned that blew the hg, was my first one and it was a non turbo, it had 93,000 km on it and i drove it until it blew at 99,000 close to a year later,,, i have never had a gte blow on me yet,,,,lol ...yet......
i would check the bov, and check for intake leaks, honestly i would try to setup some kind of setup with the other bov and see if it goes away. our stock bosch bov's are good for stock use, are you running stock psi?
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