from what i found the b16 tranny with ls 5th is the only way ull have a decent 5th at 80..the gsr tranny shows actually the smallest 5th gear then the crx sir tranny then the xsi tranny..then ls..so what i would do is try to find a s1/j1 b16 cable and add a ls 5th..itll have the same 2.3.4 as gsr tranny...longer first then the gsr but shorter then the y1 b16..and obviously a ls5th...only thing "faster" would be the gsr trans all together but itll top out before the b16 trans would...so u could get a ys1 gsr and swap out ls 5th for an awesome set up as well