You can also have a surge with the stock turbos from letting off on a hard throttle pull or load. The remaining boost in the intake and turbo plumbing wants to go somewhere, and in most cases it tries to against the compressor wheel causing it to flutter or surge. My stock turbo used to do that all the time before I switched 😎
Are you running the 38r cause as stated above the ported housing allows an escape for the boost... I think its most likely you have a stock gtp38 turbo which is why your experiencing surge
Oh okay... I haven't had experience with the manual trucks so ill bow out of this one
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