recently i had my TFR's fuel injector calibrated, also changed nozzle tips...smoke was gone (except in the morning when i first start it up) and i still get pretty decent power out of it, but 1 thing that is really freaking me out is that it's a lot noisier than before (given the fact that it is noisy ever since! isuzu 4jb1t)...now i have to enjoy music from my stereo at higher volume. idling is smooth...its just that the engine sound was amplified...

what could be the culprit? any input would be appreciated!