MXP Comp RS exhaust and rear drag
 

For the owners of the MXP Comp RS catback exhaust, does removing the stock OEM exhaust and fitting this one create excess rear drag, as it leaves a big gap where the old exhaust setup would be???

Technically yes.

Will you notice in daily driving or tracking? Debatable. Depends on your driving sense and skill level

Technically any dual can muffler type set-up like the Nvidia N1 causes rear drag as they don't compliment the smooth under passage of the car well but like others will say, it's barely noticeable unless you're generating huge speed or downforce.