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HTT here, I took a small sanding disk to the inside of mine to smooth it out a bit more, but Im just a little bit **** on that stuff. Id say go for it! might as well if you already have the turbo off.
do the exhaust manifolds actually made a difference? Spool up any quicker? When I got my intake manifold(cfm+) I was dissapointed. I couldnt tell any difference. Can you actualle tell it has been changed?