Usually used by LSR guys who need that last few possible HP after 200mph.....hard to say if they are even beneficial from 100-175mph which is plenty fast on the freeways....
To me, if it doesn't help in the acceleration department, may not be worthwhile.
I say do it, record performance before/after such as all the 1/4 mile runs you can get in, compare from say 40-100mph, 60-130mph runs, 80-160mph runs.....need true data.
If it shows improvement then I will certainly do it myself.