and if you read ALL of the thread you will see, what it actually performed like with DATA confirming its shyte. On face value this cores been claimed to be many things by Alex.. Facts and Data however, say to the contrary... Words vs Data On bog stock k04 on a stage 1, it cooled more than twin smic.. after that, its inadequacies became more and more apparent. Pipesize is too small, and the core itself does not support the GT30 that paul runs.. It was a k04 install to begin with. Pipes were enlarged (by me) and made no noticable difference.. Only when logging pre-post intercooler on the dyno, did the issue reveal istelf, and reveal the sales patter to be very inaccurate. Avoid it.. and dont believe the AH info... its not supported by test data There is no surprise, that now knowing the data, a larger fmic was embarked upon, which was based on a core used on rs500... trimmed a little to fit an S3, and this is what should be offered imho to S3's, REPLACING the smaller, proven to be inadequate, unit. The only people to have tested it are us... as far as I am aware. The info is posted on this forum in tufftys very open/honest build thread, for others to see. My advise is forget the smaller core..