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What manifold are you going to use?

Has anyone tried those H&R ARBs?
Those are 25mm front and 21mm rear. Do you think that those are too thick?

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I think its 20mm front and 14mm rear as OEM. I heard that R32 arbs are good mod for S3 and those are 23mm front and 19mm rear. If you are changing only rear arb, then i think 19mm is too large because then it´s almost same diameter as front.