This might just be the cheapest way to upgrade the stock Harmon Kardon System. HD Part #76418 Boom! Audio Bass Booster Port kit for the
FLHTCU and FLHTK with the Tour-Pak retails for $79.95 at the Dealer (shockingly not a Hundred Dollars).

I just installed this kit this afternoon, about a 2 hour install, no special tools with the exception of a 2" hole saw. This kit seals up the open holes on the rear speaker pods with new grommets for the wiring and gaskets for the new ports. This in effect pushes some of the sound into the Tour-Pak. The kit includes gaskets and hardware if you have an aux power port installed in the pak and 2 nicely machined ports. A template in the kit makes for a no guess-work drill, the only part your on your own is if you have a tourpack liner, cutting the hole in that is a bit of a pain, but not too difficult with a sharp razor, a good pair of shop scissors and a small drill mounted drum sander.

After I installed the kit I hooked up the iPod and ran it through the paces with various genres of rock. I kicked the bass up a few notches on the reciever and was pretty impressed. I almost didn't buy this kit because it basically just punches holes into the tour pak, but I have to say there is a much more pronounced bass effect and I am pleased with the results.

 

Thanks for the review. I assume it improves bass punch overall, but is it really significant enough to notice riding down the highway ?

 

I love mine it's great at bike night. Works best when your tour pack is empty.

 

Not with 4 inch rhineharts!

 

on the highway, 90% of the sound you hear is coming from your front speakers.
i doubt the bass port makes any difference then. but for bike nights and in your garage, i'm sure it does.

 

you can always fade the sound more towards the rear speakers like I do to get a surround effect

 

I like mine but it fits the $HD because if you read the instruction it tells you for maximum effect to get a download to your head unit to change the way it outputs to the rear speakers. Thats + $35 to $40= $100+