Originally posted by rcosmax
I am using 7mm zac pipe. could this be my problem and if so can i put a 5.2 mm restrictor on the stinger or will that cause more problems?
What's the length of the pipe and manifold combo? Is yours a two piece pipe? Try making it slightly longer. You could also add 0.1 mm shim under the combustion chamber head. What is the stock shims that come with the IDM?