Just installed the fuelpak in my 07 FatBoy. What a tight spot under the seat. The unit is very bulky, couldnt believe it had to fit under the stock seat. But I finally found a spot right under the seat where the rubber seat bumper is, so I removed the bumper. It fit good. A little tight putting the seat back on. Very happy to run the best fuel management with my HS straightshot slipons and K&N high flow air filter. Test ride was noticely better. I was running daytona twin tech fuel module, but wasnt nearly as simpler or better running as V&H.