E46Fanatics - View Single Post - DIY: E46 Header Installation Guide
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Old 08-27-2008, 11:48 PM   #30
330i ZHP
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Here are the differences between Supersprint headers and eBay headers - the ebay headers are pretty much junk for a modded head....I will use them to reduce the backpressure made my the cats then install some high flow cats post headers for the wagon....Look at the differences in the internal flow - molded and beveled on the Supersprint...and the eBay have flow restrictions and the exposed pipe will cause turbulence. Also the eBay headers are not even close to being port matched to the exhaust manifold....but are the same size as the stock exhaust ports on the head.

They look the same from the outside - but the welds and the internal flow is where the extra money spent come into play

The Superspint headers when installed are closer together at the exit and match the OEM exhaust and the Supersprint exhaust - the eBay headers have a 1/2" LARGER gap

Superspint headers

eBay headers

The ports on the Supersprint - notice the smoother inner area

The eBay headers inside

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