exhaust would help too

 

i swissed the side of my box closest to the wheel. i hear engine intake and a little more sound from the turbo...........and B6 and the passat have a slightly bigger turbo, i think they call it the k03 sport, but still my chipped turbo is pushing a lot more air than their stock turbos and their's are very noticeable from inside the car.......you know its turbocharged just riding in it with no radio. if i get on it in mine its definitely fast but you have to really listen to hear the turbo. theres is something different in the design, turbo, intake or exhaust. just wish i knew what it was.

for example some turbo diesel trucks i've worked on have a silencer ring before the intake side of the turbo.......take it off and it sounds like an 18 wheeler from the turbo sound. doubt my B5 has that but there has to be something that makes it quieter than a B6.

thanks for the serious responses.

 

even a swiss cheese airbox won't be as loud as a cone intake. and the b6's have a dual exhaust instead of your single. i wouldn't really call a k03s "bigger" but it pushes a few more psi, but like you said, since your chipped, you should be able to hear it more than them. with a test pipe, exhaust, and intake my turbo is very audible

 

Passat is longitudinal mount, just like the A4 - so the turbo does not sit next to the firewall.

 

how does the test pipe do for overall sound, engine and turbo? good point on the dual exhaust, don't know exactly what difference that would make but it is something different.

and yes the passat is longitudinal.......i've driven jettas and lord knows my dad's 2.7twin turbo is louder, but i'm comparing the same setups.

 

Duals wont do anything. The cat like the airbox muffle up the sound. All you really need is an intake to hear the turbo. Just remember, the turbo is tiny and doesnt flow enough air to be to loud.

 

K03S is a big difference. I'm guessing the sound deadening material/placement would make a huge difference too.

 

The ko3s on the transverse engines actually come with a silencer/muffler on them.

 

I had a 00passat and when I got the flex pipe replaced, the turbo bcame very loud. The same thing happenned 2 weeks ago when I got the flex pipe replaced on my 01 a4 TQM. The turbo became very loud. The spool sound is almost annoying now.(but i still like it) I think the sound is due to the flex pipe not being OEM because it was replaced at a regular muffler place. I looked at it and the new flex pipe is a little smaller in diameter than the orignal one. Do you guys think the smaller diameterflex pipe is more restrictive? I told the guy but he insists that it isn't, he has "been doing this for 35 years". What do you guys think? I personally thinkhe's a dumbass.

 

He is a dumbass. Turbo cars need no restrictions after the turbo. How big depends on the turbo and power level. 2.5" is the smallest you can go w/o being much of a restriction.