High tens could be hard RS flash has one of the fastest subies in wa I believe running a 10.4 last month with 580whp that car once again won the wrx vs evo battle at the drags high 11s or low 12 with that sort of horsepower your quoting but as they say the strip never lies. Keep the updates on the engine build coming v6 STI is one of my favourite looking suby good luck with the build.