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Ok guys and girls its time to play " whats that noise?! " :)

K, when my GTS hits 2500rpm i get a really horrible noise coming from the exhaust which lasts to about 3000rpm.

Its like a vibrating note and sounds like shit.

Just wondering if its my Catalytic Converter, Muffler, Natural resonance or me???

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assuming you have a stock exhaust, One with the twin head on it???

Have a look down the righthand side and you should see a flap over the hole, blocking it..

Like this... ex2.jpg

I believe the cable you can see in the next photo opens the hole when the pressure builds up or the car reaches a certain rpm!! This could be the cause of your noise! I find mine gets louder around the same time!

There is a cable on the upper right hand side that opens this flap!ex1.jpg

Just a thought!!!!

I know what you mean, its like a flapping, cracking noise from about 2500-3000, i think its a N/A thing, i got a barrel muffler put on and it just mad it louder sounds kinda cool like you got some funky mods or something, after a while when the engine heats up after 10mins or so it seems to die down a little bit. I can never work out what the noise is, i heard the cams do it aswell.........

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