Evo 7 Clunking at high RPM's
 

It's really hard to describe what happens here but here I go.

First of all this "clunking" only happens in 4th and 5th gear, and only when my foot is to the floor on the accelerator. The car goes like "clunk, clunk, clunk" every few seconds and when I come back off the throttle it stops. Also the rev's don't drop at all when this happens, so it wouldn't be the clutch. It hasn't always had this issue, it's only been recently that it's begun happening.
I'm not sure if this is the same as the Evo knock issue and it's appeared randomly without doing anything to the car.

I've just replaced the fuel pump to walbro 255lhp and freshly used injector cleaner to clean the injectors. Mods I have an the car are: Blitsin shocks and springs(Same as evo 8 MR) k&N air filter panel and Exedy HD Clutch.


Hopefully I've described it well enough for you to understand, so I can fix the issue.