Injen doesn't make a bypass valve.. you
may be able to use the AEM one but I doubt it...
From what I've heard there isn't really a gain in performance in using the Injen Race Division CAI over the AEM CAI.. in fact I think some people have said that performance may be a little worse with the Injen.. I dunno.. of course there are other folks who are perfectly happy with their Injen intake so I suppose it's just up to what you prefer..