Yesterday I put the M4 midpipe on my 07. I wasnt too happy about the fitment and want to avoid exhaust leaks so I am taking it to get welded today. My question is weather or not I should have them remove the honeycombs. I was happy with the sound with them in. Will it be a lot louder with them removed? Also, performance wise what it better? Do they provide back pressure that helps performance or so they hinder it? Any help would be appreciated I am going to get it welded today.