ive got a gsr swap in my ek coupe... its prety ****** loud dude...ive got one resonator...will 2 be a noticable loss in the power band....right now im using stock exuast and header as well... so im on the weiner piping...plan to throw a rsx type s exuast on with 2.25'' piping and use the rsx stock resonator.... and if theirs no loss in power ill throw on another...