do you gain anthing by putting it on a N/A settup because i have one sitten here it use to be on my parts car

 

Probably not. N/As are pretty rich as they are.

 

so should just leave it off

 

u should sell it to me... depending on the model and condition

 

In theory you could lower the fuel pressure and make the car a little leaner to gain some power, but that's a pretty crude way of doing it. Coupled with all the fittings it would take, it's likely not worth the trouble.

 

yea they had it rigged up to the car before i took it off

 

this is true, i did this on my na. ran the fuel like reteds parallel setup. big difference i noticed is that you have to make a custom secondary fuel rail. this is becuase on the s4 the fuel pressure regulator is bolted on the side and is not a screw in. i lowered the fuel pressure a tiny bit and felt a little difference in the butt dyno but no real numbers. my intetions were to use this setup coupled with a wet nitrous system. so that the fpr would also help maintain fuel pressure in the soleniod.
here are some pics from the project

http://i21.photobucket.com/albums/b2...a/sx_6_fpr.jpg
http://i21.photobucket.com/albums/b2...ndary_rail.jpg
http://i21.photobucket.com/albums/b2...or_nitrous.jpg
http://i21.photobucket.com/albums/b2...d_into_fpr.jpg
http://i21.photobucket.com/albums/b2...other_side.jpg
http://i21.photobucket.com/albums/b2...so_y_block.jpg
http://i21.photobucket.com/albums/b2...l_brackets.jpg
http://i21.photobucket.com/albums/b2...ure_sender.jpg
http://i21.photobucket.com/albums/b2...ure_sender.jpg
http://i21.photobucket.com/albums/b2...d_90_bends.jpg

 

the dude that put the pressure reg put it were the stock one's at

 

so what connection would i need to hook it up