Siraniko

iTrader: (13)

are there are any marks to differentiate a S4 from a S5. I have a variety, unmarked so it is very confusing for me. I've searched but I cant find any leads. pix please. I'm not a FC lover but in the process of stock TII conversion on an old school RX.

thanks

RotaryEvolution

iTrader: (30)

S5 UIM has a dent in the front runner for the intercooler, the runners also progressively get higher towards the firewall. S4 has no dent and all runners are equal height.

for the S5 LIM versus S4, S5 has no EGR on the firewall side of the manifold, S4 has an EGR boss on it. S4 JDM intake manifolds have no EGR boss but they do have a port on the rear runner outside for a banjo fitting for the brake booster.

an S5 UIM won't directly fit on an S4 LIM and vice versa without modification to the mounting holes in the UIM(a few mm difference in the outer bolt holes). with port matching and some dremeling either can fit.

K-Tune

iTrader: (26)

Also the S5 lowers will have fittings for the secondary injector diffusers.

Siraniko

iTrader: (13)

thanks Ben. that was easy, EGR on the side.

j9fd3s

iTrader: (3)

i always spot the S5 lower because its got that vacuum hose between the two injectors.

Siraniko

iTrader: (13)

i noticed that. thx

RotaryEvolution

iTrader: (30)

forgot to mention that, i always just look for the lack of EGR and/or brake booster port on the LIM.

philiptompkins

iTrader: (4)

This one may have been beat to death already but is there any performance benefit with an s5 over an s4?
I have a s5 tb but an s4 lim/uim.

RotaryEvolution

iTrader: (30)

s5 throttle body won't work on a s4 car and there is no benefit between the 2 throttle bodies. the LIM is nearly identical between the 2. the UIM has variant runner lengths on the s5 and flows slightly better for a hair more top end performance.