Slight difference yeah but then I changed to EVO trumpets, rather than the s50 trumpets on the intake, the aim to get more out of the low end using the trumpets and simota combined. Was trying to increase from 286 to get near 300 by doing this but reduce top end which didn't bother me. The carbon on the simota is more for heat shielding too, as there is a cone filter in the centre. If everything was running smooth there would be a difference I guess but hard to tell now other than induction noise!