i have a 03 coupe with 5at, the exhaust seems a lot louder on the first 10 min of operation. almost like the muffler has a bypass. anyone else notice this.

 

it sounds a little louder... I *think* this has to do with the idle rpm's being higher to warm up the engine quicker.

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2004 TB/W 6mtC. Sunroof only.
Bel Vector 985
Grounding Kit
Splash Guards
Custom Carputer
Custom FG Sub
Infinity KapPerf6.1, Ref 6002si, 5760 6-ch AMP.
30% Huper

 

I know what you mean but I dont think it's a good thing. I think it has to do with the fact that the car is not warmed up yet. I get that if the car isn't warmed up and I have to get on the highway right away. I try not to accelerate too hard until the engine has reached normal operating tremperature but the exhaust does have a different tone still. It's probably cause the oil is stil down in the bottom of the engine. You should probably wait a few sec before getting on the gas.

 

wizawuza is right it's because the idle is higher. Another factor could be that since the engine/exhaust is cold that the condensation in the exhaust gas is not vaporizing and you hear a bit of the gurgleing of the water sloshing around in the pipes and mufler. Once the exhuast is hot the water simply burns off.

 

What I've noticed, is that if I drive the car for a while (bring the engine to a normal temp operation), then park somewhere for 5 minutes, get back to the car and start the engine again, there is much more * growl * than when I start the car and the engine is cold. I'm not talking about idling tone for the first few minutes, but rather the first second as the engine fires up - don't know, just sounds meaner [img]/w3timages/icons/cool.gif[/img]



MY G-ENIE

 

you gotta love that first growl

i heard a g start up in the same parking lot a couple rows away =)

 

i like the sound better cold then after the car is awake

 

Expansion of metal passages changes in hole diameters within muffler, pipe diameters, etc. Also the speed of sound changes with the air temperature changing the tuning.