I have search and haven't found a anwser.

Are the JDM Valve Springs and Retainers good to keep for 9k Redline or should i give it a little upgrade. Its all JDM Head im just wondering hitting 9k alot going to damage the springs or upgrade now or down the line when the are shot.

 

might as well upgrade just to be on the safe side. price difference isn't tooo bad

 

i think ill have IB add it in with the final build