That's to be expected. My 2.0 TSI VW CC with a Borla catback became a bit too much when I added a downpipe to it.
'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc)