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Yesterday I did the airbox mod and TBTC porting then tuned with MBC for a bit. I noticed that from 10-15 psi under heavy load I'm getting a pretty obvious vibration from the needle in my VDO boost/vac gauge. Is the is common or something I should be concerned about?
Car;
'97 900 SET
Mods;
Dawes MBC
3" airbox w/ KN
removed turbo silencer
port TBTC
posted by 68.1.19...
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