so i can retain and use my s4 LIM right? thats what it soun ds like to me, and somone already pmed about a s5uim for 100 and he sure it has the rails on it. and does all these vac lines on the s5 go to places on the s4, since i dont have a manual as i lost it i dont exactly know. thanks

The modification of the S5 UIM in my picture was so I could bolt it to the S4 LIM. Make sure you get the S5 primary rail too.

FSM: http://www.rotaryheads.com/PDF/2nd_gen/index.html

i dont need the secondary then? just primary, and will i need vac hose to do this? i mean i put silicone vac hoses on whole car but was a little short, so buying some more wouldnt hurt my feeling as when i have the tp off im going to change all the rest that were hiding.

No, you need both rails.

Yes, you need lots of 3.5mm vacuum hose.

can i use 4mm? thats what i used when i put red silicone in

Yes, but 3.5mm fits better. Given it's NA, the 4mm is fine, but I wouldn't use it in a turbo application.

Silicone lines are slicker than rubber, I used little zip-ties on all my vac ports when I removed emissions and replaced vac hoses (all 3 of them) with silicone. I figured, it couldn't hurt.