have you ever heard like a rattling noise when you have a wide open throttle? cause i am, i made sure nothings rattling or loose in the engine bay. and weird thing about it is i can only hear it when i around 6k to redline

 

Well, I'm hoping you are aware your secondary air intake opens at 5800rpm, so it may be related to that.

 

someone dumped gravel in your gas tank

 

I think I know what you are talking about. Is it a metal to metal rattling at about 4k-4500 rpm?

If so it is a problem with the exhaust manifold. I'm not sure exactly what it is but if you put an aftermarket header on, it should solve your problem.

EDIT: Never mind, just reread it and what I'm talking about happens at lower RPMs and then stops shortly after. OOooopppss

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cnydc2 &raquo;</TD></TR><TR><TD CLASS="quote">I think I know what you are talking about. Is it a metal to metal rattling at about 4k-4500 rpm?

If so it is a problem with the exhaust manifold. I'm not sure exactly what it is but if you put an aftermarket header on, it should solve your problem. </TD></TR></TABLE>

it could also be your heatshield for your cat.....i had a rattle from my stock exhaust manifold b-pipe so i got a header and it went away. then a yr later, i got a similar rattle and its the heatshield.

 

Its your heatshield...I have had this problem with both of my GS-Rs.

 

indeed, me too.