depends... you have a convertible so it is recommended to get subframe connectors... if you get the spintech stepped connectors you won't lose as much ground clearance.
i had trouble with bumps without my car being dropped even a little bit...
their muffler is very different than what you would be installing... the Cobra R side exhaust is designed for the IRS of a cobra so the muffler is in the middle and then from it exit two pipes. the pipes hang really low on the cobra R as well.. dangerous to go over bumps.
mine is a daily driver as well...
the driveway is steep and i have 4 bumps to go over just go get to the main road... and from then on bumps everywhere...
i thought about it and decided that i want to be unique so i got the roush exhaust... i've been looking under the car to figure out if i can squeeze some more clearance and it appears that i could... however it's not too much...
it's just a risk i had to take and i have not regretted it once...