man...you guys can bitch. i can feel the estrogen from here
r33cruiser made a valid suggestion, and it seems like it would work fine......IF you wanted the nipple that far up the pipe. i dont, so will probably go for the weld, or tap and cement option. plus i'd be nervous about the nut coming loose, even if i knew it couldnt. lol.
btw, as far as turbulence inside the piping....have u seen the standard nipple inside the pipe? im looking at a stock r34 lower cooler pipe right now. it prodrudes almost an inch inside.