Hmm..
Okay, OBX is "easiest" to buy, but not the best? I have read lots of threads about that 4-1 vs 4-2-1 fights here... But still people buy OBX 'cos it's best for that money.
Could some other header be used? Foe example: LINK MX-6 header? MX has also FS-engines and has 4-2-1 headers, and...