so not to take anything away from brian b/c he is awsome but, you picked up 16 wheel and you changed a smashed y pipe? sorry but that 16 wheel could be many diferent things. I wouldnt say it was in the tune or the way it was tuned (sd to maf). hell, linn pick up 40 wheel with just a cutout. a smashed y pipe would be the difference. so could weather and different dynos. but if "feels" stronger thats all that matters.