05-04-14, 04:34 PM
Hi mate,
The Sandy Spares headers are to be avoided. Designed to fit the Fazer but not designed to optimise gas flow, if you know what I mean.
With any of the properly designed 4-2-1 systems (ie, the Akrapovic with tapered headers like wot I have) there is still a little lag in the 3 - 3.5k rpm range that no amount of tweaking will resolve. I don't notice it, though, in normal riding. However, when the tacho hits 4k rpm, it's solid pull all the way to the redline. Very noticeable gains over the standard headers from 5 - 6k upwards and the motor revs out quicker, too.
A good 4-1 system needs a horizontal merge plate in the collector to prevent any flat spots low down. The Muzzy 4-1 system is stronger low down than the stock headers with EXUP but they're no longer in production and sold almost exclusively in the USA.
I think Ti Force used to list a full 4-1 system and that was gorgeous but like all the other good stuff, cost a bundle.
The Sandy Spares headers are to be avoided. Designed to fit the Fazer but not designed to optimise gas flow, if you know what I mean.
With any of the properly designed 4-2-1 systems (ie, the Akrapovic with tapered headers like wot I have) there is still a little lag in the 3 - 3.5k rpm range that no amount of tweaking will resolve. I don't notice it, though, in normal riding. However, when the tacho hits 4k rpm, it's solid pull all the way to the redline. Very noticeable gains over the standard headers from 5 - 6k upwards and the motor revs out quicker, too.
A good 4-1 system needs a horizontal merge plate in the collector to prevent any flat spots low down. The Muzzy 4-1 system is stronger low down than the stock headers with EXUP but they're no longer in production and sold almost exclusively in the USA.
I think Ti Force used to list a full 4-1 system and that was gorgeous but like all the other good stuff, cost a bundle.