06-15-2013, 08:20 PM #1Member
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Does everyone have the primary and secondary cats reversed for the m3?
So I felt like reading the entire technical pamphlet on the M3 and a lot of that is the s65 engine and exhaust. I was quite surprised to find that they clearly describe that the "primary" cats are actually the minor metallic higher flow cats and the "secondaries" are the main cats which are denser ceramic. Now if anyone else knows especially with test pipes which are only removing the front "primaries" this is information that I have never heard. Sure the fronts are "primary" in location but clearly they are higher flowing metallic and are not a major obstruction which makes a lot of sense given the secondaries to me always seemed much larger.
Do test pipe people really not know this? (the manufactures ) or any company with x-pipes who could use this to sell their xpipe with HFC over test-pipes which leave you with the main cats in place!
See page 62
06-17-2013, 02:59 AM #2
I just delete all cats...Chrome Space Bar Issue: http://www.boostaddict.com/showthrea...338#post738338