Yours is mivec hence should generate enough pressure to push the valve open. Its not only the displacement but also the gas velocity that pushing the valve. If u interested, offer me lo... i just buy this muffler to test out only. Alternatively u can also try out stock turbo muffler but those are still semi flow all the way. Also normally those come with 2.5" inlet. Those chopshop stock muffler also many years old hence what was the condition inside? The most u can look out is those evo9 or wrx/sti muffler which is much newer. But those are like Satria GTI exhaust mounting so your rear section may not be big enough
if u got fact and anything to backup, then i dun think mod will ban you. can the story here?