which intercooler?
do you have the old 2008/2009 intercooler with one outlet that goes to a charge box & then to the throttle bodies? If yes, then you can probably eliminate a little lag. If you have the new style, then I don't think there is more than 1/2 second lag on my 2008 m8t after engagement... & none once I have the motor loaded a little. I can't imagine it being significantly better than that without the intercooler. Is the sled possibly running a little fat at lower rpms/boost & it has to clean out a bit before building good boost? That can be hard to get tuned out... intercooled or not.
I don't know that my intercooler helps with performance much (11ish psi @ 10K feet), but no detonation & I like it as a reed saver since i pull "under the hood air" due to my habit of brushing by trees & rolling over to get unstuck. Reeds from 2008 looked good even after a few backfires when i replaced them last season.
I have a 2009 charge box & tube that just came off a buddy's sled if you want to experiment.
