Roushcharger is a tuned down roots style supercharger. Yes, you get the Roush warranty too but if you change pullies or tune it is no longer warrantied. All that money and you can't get 400 Horsepower?
KB has tunes for autos and sticks. Whipple just came out so nobody can say what those are gonna put down.
I had my dealer install my KB and I still have my factory warranty and extended warranty. Most twin screw superchargers are reasonably quiet compared to centrifugal SC. The Centris have much more whine.
KB 2.4 IC, KB Stage 2, Level 10 tranny, Kooks 1.75" LT, Powerhouse, FRRP, Moroso, M/T, AFCO, Autometer, Hot Rod Chassis, ST Motorsports, Moroso, Granatelli Motor Sports, Simpson
118.98 MPH 1.63 60'