I wouldn't bother with the 103's, they are only necessary for builds with like 15 lbs of boost.
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Boost has nothing to do with it; it is just the setup in general.
I ran 103's in everything. I don't care. Old motor; old tech. It works.
However; canned tunes are USUALLY the issue. I'd check contact with the body, etc on your headers. I'd also put new mounts in it to eliminate any false KR possibilities. The 3.5" shouldn't be an issue though...then again every car is different and with them getting older and older the carbon build up is doing nothing but adding compression lol
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