Hey guys
Wondering if you can help me out with this annoying problem that has happened since changing to a 3' front/dump pipe and hi flow cat from its stock parts, the noise occurred straight after they bolted on those parts and on my way home the sound is like tiny rattling metallic or cicadas and it only happens on a certain RPM such as near the 2000 rpm range, i also noticed that the rattling sound only appears once the engine/exhaust is hot, the rattling is more pronounce from inside the cabin when driving against a wall.
The cat and front/dump pipe has no heat shield so it cannot be them.
I took my car back to them to see the problem and they said they don't hear anything when driving my car other than the turbo spool up louder then before but everyone that has sat in my car before now notices it too, they also took apart the cat to see if perhaps anything is inside (nothing) and re tighten the bolts but still to me the annoying sound is still there and they said they don't hear anything.
On a another issue (Sorry if i am asking too much ) but I've read on many forums that after changing the dump pipe i need to get a tune to prevent boost rising or detonation etc, but i have personally been to my local mechanics and they say it is not necessary unless i am chasing big power or getting more KW out of my pipes and cats.
My GTT is an auto and is pretty much stock with these aftermarket pipes and cat, i am not chasing big power and not after attention that is why i just changed to these 3' pipes and cat but left the catback stock to avoid attention however from what i have read is dangers of boost rising, detonation, o2 sensor and ecu problems has made me thinking i need to get a tune to stop my car from blowing up.
What do you guys/girls think as on forums they say a tune is a must but my mechanics say it is not needed. This is confusing the crap out of me......