My Aurora 5000 doesnt really whistle loud until around 55-60 lbs. of boost. anything under that its basically silent. I heard thru the grapevine that the Garrett Ball Bearing turbos create quite a whistle and are very responsive.
pull you silencer ring and instead of a torque tube use a piece of 4 inch exhaust pipe for the center pipe. It will whistle like crazy, problem solved. total cost about 7 bucks for the pipe if you dont have any laying around.
Hx-40 with the 6-blade wheel is pretty damn loud but it would be hard to get 600 hp with it! twins like an s-300 over a k-31 pretty loud but twins will quiet the truck down a lot!
My HTT is very loud!! I dont know if the stainless housings make a difference, but the wife hates the Jet airplane sound in the cab!! When she complains I just look at her and start laughing!! She says it so loud that she cannot sleep in the truck on a road trip.
Man i cant believe i forgot to say this but, my dad has an 06 and my brother has an 04 both identical 4 doors and they both put on K&N cold air intakes on and i tell u what... you can hear their turbo coming down the road before you hear their straight exhasut. Yes its that loud. Im trying to talk them into puting on some BHAF's and i heard once you do that, they really whistle BTW they are both stock
I would think just doing a BHAF would be enough with the stock turbo...I just got no silencer ring and TQ tube gutted and you can hear my turbo before my straight pipe sound
my auroara 3000 whistles pretty good at low rpm heavy load situations. she starts to whisle pretty good at 25lbs then at about 45lbs shes a singin! thats with a steel 4" pipe as the intake tube and a bhaf. but a buddy of mine has a 7.3l ferd and 6" exhaust from turbo back! holy crap does that whistle you can hear him on the highway like 300yds away and almost hurts your ears when he passes you
you could just run without an airfilter...my buddy is stupid enough to do it and you can hear his 6.7L way before you hear the truck and it does sound like a jet taking off in the cab and next to it as he floors it but long story short dont do it cuz he already dusted the motor at 6000 miles and motor was red flagged by the dealership
a set of twins with stock turbo on top and s400 on bottom whistle a ton and can support 600 horse arty018:
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