This S475 whistles more than the HKS T51R KAI
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#13
At first i had the exhaust dumped under the car and it wasn't really that loud. Then i ran 4" exhaust out the back with a 4" dynatech muffler and it got louder! Now i have the exhaust exiting out the side and it's somewhere in between. All and all it's really not as loud as i thought it would be
#23
just so you all know, i just got a T04Z turbo with the anti surge housing and i have a standard housing too, so im doing a back to back dyno test to see if the anti surge make any difference in numbers. ill let you guys know then