Hey guys,

Wondering if a S5 RB Downpipe and presilencer will fit S4 because the S5 has an additional pipe for the air pump so it's not a direct bolt on.

What would I have to do to make them fit.

Reason for doing all of this is that I have the opportunity to get RB products for only a $100.

 

up

 

There are two styles of RB pre silencer, the "old" style and new style. Assuming you are talking about the "new" style, either one fits dimensionally. Obviously though the S5 silencer lacks a back pressure tube/fresh air tube. This tube on S5s
and any TII makes a great garbage can weight. However S4 NAs use this tube to actuate the six ports. Without it you will either have to dump your six ports alltogether, or use one of the other common no airpump/no tube mods (there was
a great FAQ some where I don't remember, try search maybe??). On an S5 NA you
can use either, it's just the back pressure tube is useless on an S5 with no CAT so
it's eliminated for simplicity. Hope it helps.