definately worth doing.
i had a 4''fmic with the standard pipe run and car was making big hp but drivability was crap coming on boost as the turbo spool up time was slow.
i removed the ic and fitted a smaller radtech version with very short pipe run and the difference was huge as the turbo now spools up much quicker than before.
not been on rollers since and tbh i couldnt care less what the bhp figure is, what matters is that the car is much more drivable throughout the rev range.
the bhp figures (whatever they are) are merely just for pub talk, its how it gets there what really counts;-)