The roots type blower will be quieter than a vortech. You will experience more boost at lower rpm, but on the street this could be a disadvantage unless you can plant all that power to the ground i.e slicks. They are both good blowers but the reason i went w/ vortech is b/c if you ever upgrade or build a better engine the vortech just needs a different pulley to add more boost. Whereas a roots type will only put out 9lbs. of boost maximum i believe. Just something to think about.
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12lb. vortech,svo heads and headers,Pro80M,70MMTB,steeda aluminum radiator,30lb. injectors,MSD,cobra front fascia,hood,wheels,eibach,3.73 gears w/ steeda triax,offroad h pipe w/ flows,forged pistons,dyno tuned at 395rwhp.
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