Quote:
Originally Posted by donovan
Quote:
Originally Posted by SDCoupe
I've heard about these. They remove the primary cats right? What performance gain do these give? Does the rest of the stock exhaust system stay in place? Any mods needed like resetting the ECU or is this completely plug and play?
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Well.. for the s54 the euro headers do remove primary yes. Performance is about 30rwhp or MORE with a tune of course. 
Do you have a z4m or e46 m3? |
I have a Z4M. These headers are on my dream list. The list is long.