supra tt fuel pump? how?

at rx7club i always see people selling supra tt fuel pumps for sale? does it fit? and why ? is it better then one of those 255 ones you see for sale or anything like that? and how much do they cost and is it worth it?

The Supra Fuel pump allows you to get more fuel to your engine and is a must have upgrade if you are to single turbo your FD. Yes it does fit.

I assume that it must be adapted to the FD in tank assy. Should be quieter than a Walbro too.

is the supra tt one better then a walbro?