I'm not being a hater, I have an actual b18c5 in my 89 si. However, I feel you're trying to gain unreasonable hp. Sure people will say they did it....and it blew up. Only way you'll get 300hp n/a is nos
toda will sell you 250hp c5 for $15,000...what the??
but to answer your original question: why not the c5 tranny?!? It's LSD & geared properly. Otherwise I would agree with the blurry green's suggestions.