I know that Y-pipe is the best mod for the bucks, but does anyone have Pullies and flywheel without the y pipe. and what is the improvements really like? Is there affordable brands like the Y pipe?

 

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I cant give you comparisons without the y pipe, but I know that for the UDP, their are some cheaper Co's then UR.
I believe right now their is a group deal going on, http://forums.maxima.org/showthread.php?t=318589
The flywheel is going to cost a bit more, then you have to factor in the labor if your not installing it yourself.
Remember, these items do not create HP, but free it up. So you wont feel not real great gains from them.
With the flywheel, you will climb through the rpm's much quicker though.
The flyhweel/UDP is a good setup if you have done everything else.
Have you considered the an ECU upgrade. Thats one of the best bangs for the buck, and you will feel the diffrence with it.