4.3v and n75, the n75 wont limit boost (since it will see 11psi and never see 14psi) and you will spike really high if it ever stops boosting. you would need a mbc to limit the boost. You shouldnt have any problems running a 4.3v diode with a 225, but possibly a cel. You should give it a shot, all you would be out is time if it doesnt work

 

nice thats exactly what i wanted to know cincy, i figured the n75 would keep trying to add boost since the 14psi would never be met, as far as fuel is concerned the fpr and maf will see actual boost so the diode will have no effect on a/f. side note-- diode and mbc have been ordered (gauge already installed)