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i've got myself a pair of rs4 downpipes to play with. already got the precats out. thinking about doing maincats aswell.
anyone down this, how much louder is it? and i read about unplugging rear lambdas etc?/ any of this true?
cheers tom

the RS4 downpipes will be better than S4 one's..remove the pre-cats but keep the main as there only 200 cell i believe..better already..
plug the rear lambda hole and just keep the original front 1's..im sure you only have 1 front lambda on each downpipe..

Do as Woody says, its the best way forward.

I removed the main cats too on my S4. It sounded terrible with the std exhuast so I put the Cats back in. However when I moved to a custom dual effort I temoved them again and it sounded great, and gave some extra beans too....