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Check out www.vclassics.com They sell headers for the B21F for stage 1, 2, 3 modified engines, but as mentioned, even a mildly modified B21F won't be able to take advantage of even a stage 1 header. The rule of thumb is stage 1 for street modified engines should have vastly inproved head flow, ported & polished, radical cam lift and overlap (not your VX cam), bigger injectors, overbore, etc. I have one like that in my garage, but it won't pass emissions.
Stage 1 is a 2 1/2 inch system all the way back, stage 2 and above are for racing, a 3 inch system.
BTW K-Jet can be just fine with the above mod's. Just get the FI distributor from a B21FT or 264 V6 that is adjustable and larger bore and use the turbo injectors.
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'89 245 Sportwagon, '04 V70 2.5T Sportwagon
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