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supunna_picta · 08-26-2011, 10:14 AM

It is a brief rattle, every cold start - so maybe it's a little longer than 5 seconds but no more than 15.

It would be surprising that the rattle would go away due to heat expansion that quickly because nothing is even warm to the touch in 30 seconds of running at the muffler. But that's where the rattle sound is coming from.

@red6speed actually our WRX does make a cold start noise but comes from the engine and sounds more like valve chatter for a few seconds.

I would be curious if anyone with an aftermarket header-back exhaust reports the same sound.

[edit] saw Pats response. This has done it from new since day one of ownership - like I said it's more annoying sounding than anything but I am interested in figuring it out for sure. I'd be fine with the pre-heat logic.

08-26-2011, 10:14 AM	#12 (permalink)
supunna_picta Base Member Join Date: Mar 2011 Location: Englewood, CO Posts: 102 Drives: Red 370z Rep Power: 14	It is a brief rattle, every cold start - so maybe it's a little longer than 5 seconds but no more than 15. It would be surprising that the rattle would go away due to heat expansion that quickly because nothing is even warm to the touch in 30 seconds of running at the muffler. But that's where the rattle sound is coming from. @red6speed actually our WRX does make a cold start noise but comes from the engine and sounds more like valve chatter for a few seconds. I would be curious if anyone with an aftermarket header-back exhaust reports the same sound. [edit] saw Pats response. This has done it from new since day one of ownership - like I said it's more annoying sounding than anything but I am interested in figuring it out for sure. I'd be fine with the pre-heat logic. __________________ 2011 Touring/Sport/6mt \| winter: 2009 WRX Last edited by supunna_picta; 08-26-2011 at 10:18 AM.