Just a note about the parts that connect the banana pipe to the header, some are steel and some are copper, you can 'weld' them together with a Benzine torch and silver solder and dispense with the hose fittings.
If you don't like the fittings use your own flexible copper pipe to connect the 2 important ends like this.
Just keep the length of the stock connecting pipe as close as possible so you don't loose the tune.