ok so here is an old question that I have not seen discussed recently.

My mechanic says not to polish, will be better off by installing two
(twin engines) of the redundant big racors, I'm sure that's the best
way to go, but at $1,200 each I'm looking at spending aprox. $4,000
when you include instalation.
I was thinking to buy a couple of the large single Racors, one per
engine and leave the old small units for redundancy, if I can make this
work I can probably get it done for under a thousand bucks and still
have a redundant system for each engine.....
And of course there is the question of professional polishing...
thoughts out there??