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Originally Posted by 4themasses
I put a 97 M3 OEM catback on my 328. Figure it's good for 240hp or more so it should handle all I'm going to invest in it. $120 on Ebay. If there isn't any "extra" air coming in, there's no need to get out for $600-$1000 in headers and exhaust. $ wise it's not "best bang for the buck".
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very good point! I think if you look up a lot of numbers you will find that headers, etc. do not give you the kind of numbers for the $$$ that a CAI, software, pullies, etc. would do for you for much less money. I also do not think you need to get new software when you go with an M50 manifold. but i may be mistaking
BTW Komodo, O2 sensors make a lot of difference, they affect your MPG quite a bit from what I have read.