If you had a bad gasket or something like that the idle would be noticeably bad. Lastly a Boost leak is a pretty typical cause of low boost - so any line on the Pressure side of the manifold, or anything loose on the bypass. The MAP will tell your the "real" boost and a data log will tell you everything else such as slipping belt or slow bypss etc. I am assuming you don't have an ECU that does data logging or lets you read the MAP sensor. If anything was bad like an idler of tensioner the SC would throw the belt - thats the only reason other than alignment (which never changes) that it will throw a belt Best practice change belts every season and check tension 2x a year. Whipples are not very efficient - they take more HP than any other SC to turn, the 4,0 takes well over 100HP even at mild boost, so it hard on the belts, especially if you are on and off the gas alot. Third most common is a slipping belt - Belts age, stretch and come loose. Its also good to have the boost line separate from the bypass vacuum sense - that should be dedicated. Since it run off engine vacuum you should make sure the line to it is good - if its hanging open the boost is possibly leaking - if you actually closes on start up the diaphragm is probably good - but you should acheck all that periodically. if it hangs closed on idle you will literally FRY the SC, Then best practice I tell everyone I do an SC for is to always look at the bypass to make sure its open at start. The second most common issue is bad Bypass valve that is not closing - The Bypass is SUPER critical on Twin screw. The most common issue is a bad boost gauge Unless you "inhaled" something that went through the SC - they don't "get loose"
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