If you use it at 300psi it will clean better and faster, if you cut the hosing down you'll need to more cuffs and a joining piece (HM sell them) and your original hand tool may blow its trigger as it may not be capable of 300psi but you could always clean upholstery at 130psi.
If you need new stuff like that cheap try ebay there are good new sellers on there.
Shaun