I have experience with the Pro 1s and they sound awesome and give you good top end power (I made 180whp on a B16).... mid range sucked though. But mind you, it was on a B16 with 11:1 compression, so I did not have ls torque or as high of a compression as you do... IMO you should have a small shot to go along with your motor build to give you just that much more of a punch at low end - mid range. Like a 25-50 wet shot... Just my 2 cents.