Turbo whistle

[pine stag]

I have a 2004 BMW E46 320d 2.0 M47 engine with a Stage 1 tune, but as most of the other ones I've seen make a whistle when revving and also when releasing the throttle, mine has more of an airy sound ("cha"?) And I'm not sure why that is. Might it be that i still have a catalytic converter or something?

[steel tiger]

Your probably hearing your intake, not sure what you mean by whistle but others could have a bov venting to atmosphere would be my guess

Maybe send a vid of the sounds

[paper trench]

What did you do for the "stage 1" tune? Stage 1, stage 2 etc is completely meaningless. Often enough stage 1 is just map, but some do intake, exhaust etc under stage 1 too.

[last quartz]

Diesels don't have bov's

Straight pipe should give you some turbo whistles

[steel tiger]

Ah didn’t know it was a diesel my bad

[pine stag]

well i think the straight pipe might be the solution but isnt that bad for the engine?

@steel tiger @last quartz @paper trench

[pine stag]

idk i didnt do it myself

stage 1 chip tune is what the guy said it was

he did do exhaust under it tho

[hushed wigeon]

GG @pine stag, you just advanced to level 1! Chat more to level up and earn top roles!

[paper trench]

Straight pipe isn't going to hurt your engine but it will be too loud for legal limit and sound absolutely awful

[pine stag]

i really like how it breathes when you let off the gas, im not sure if it would be the same for me but i would like it

problem is that here you have to pass an inspection once a year so then id have to change something probably or just put a muffler on

and its in june so idk

[last quartz]

Louder than legal limit yes, but straight piped turbo diesels aren't really very loud