I don't think much. accord v6s were 15.0 when 99 v6 was out and they got faster from there. I imagine it was prob a 20hp difference maybe a 14.4-14.5

the new coupe 6 speed is a pretty baller car

I've seem stock gsr (I/h/e) run 14.8-15.0 prob around the 160-165 whp range