Well... the subject says it all. it's gutted, and brushed on the inside... no little bits to come off into your turbo. $40 or $20 + your Stock one.
Neither... Long night... we couldn't get the studs off my stock one and all the auto parts stores are typically closed around 1 am... so we just gutted the one that came off the car and put it back on. So now i have a stock up that's been gutted sitting in my trunk, that i have no use for.
Power gains will be the same. it's actually been dyno proven that a gutted stock up pipe is within .1 hp of an aftermarket up-pipe.
I don't think that bumping almost 2 year old threads is what we mean when we say "use the search button"