open downpipe has a nice underwater tone to it but personally the fumes ruin it for me

 

I read an article a few weeks ago which stated that, if the exhaust is too big, you'll have boost spikes due to lack of back pressure. You should ask an exhaust Guru to elaborate on this. I would stick to the 2.25" exhaust for that size turbo.

 

i was reading the same. And that these people making 3" and even 4" exhuasts are actually hurting their power

 

hurting power
maybe on na cars