mnguy

i have an s4, and i read how the 5th and 6th ports are activated by back pressure.
then i also read on here that if i were to get the racing beat presilencer they should still work.
and i currently have the streetable RB header (http://www.racingbeat.com/FRmazda2.htm)

i ws wondering if i install the header and get the presilencer will my ports still work normally or will there not be enough backpressure for it?

Sideways7

iTrader: (7)

If you get the header and presilencer then they will work regardless of the rest of the exhaust. You obviously still have to have the split air pipe hooked up, though.