I recently bought and installed a Jardine catback exhaust system, nice quality, good fittment, great price, however, there are no resonators, just straight pipe with nice tips from the mufflers back. I notice that on the Flowmaster, Borla, MagnaFlow etc. that they all have resonators as part of their system. The car now reacts slowly, unless under full load (under hard acceleration). It just seems to hesitate and is not quite as quick and sharp under "normal" driving. Can this be because there is not enough backpressure, and I in fact need resonators? I have a good cold air intake as well, no other mods other than cosmetic (wheels & grill). This is my first post, so if this topic has been discussed before I apologize, any thoughts, anyone?