Is there any benefit to installing a S4 exhaust manifold & front pipe on a S2/S3 Sipder? The other question is will the S2/S3 single wire O2 sensor fit the S4 front pipe without modifications? My front pipe should be replaced. I may be able to get a manifold & a solid front pipe for a S4 for a bargain. If it'll fit I just may be tempted to do the swap. I can get a new Magnaflow front pipe for the S2/S3 for $225.00. But I figured WTH if I'm spending the money anyway why not go for the gold. The S4 ex manifold looks sportier. BTW I dislike headers on a daily driver.