I know people who have seen a reliable and noticable drop in EGTSs from performing this mod on a new turboed supra. This does screw up some cars though. If you do this to a 4AGE it will not idle properly at all anymore. Theres some sensor thing in the tb that needs to be heated up to provide the right signals to the ecu. I don't think this an issue on supras, but you may get driveablity issues in sub zero weather.
This is an old hot rodders trick, its been around for decades, and now you can buy it on ebay! Too funny
This is an old hot rodders trick, its been around for decades, and now you can buy it on ebay! Too funny