I was on the highway today in 4th gear . about 80mph nail it to pass someone and dont notice much speed increase but The car definitely gets louder intake exhaust i dont know but it sounds unusually loud

looked under the car quick looks fine dont think there is a exhaust leak.

a couple things i had done recently (less than 200 mi.)was a valve adjustment and all fluids changed tranny brake clutch coolant oil. Maybe its just me i dont know I was alo at a performance shop efore that talking about getting the car dynoed in a week ir two.

Not sure if talking hP mad me feel slow in the lude and its all mental.

Oh i have a apexi Vafc (reason 4 dyno) and the manifold pressure goes really low idle is around 580 but goes to 0 if i get on it or put a high strai on motor is that normal. maybe something with a hose connected to the valve cover.

oh how can i easily check a pcv valve squeeze the hose or something thanks alot guys .

Maybe its all in my head

 

Clutch homie. Next time you get to a freeway onramp, lay on it and see if the correlation between your tach and spedometer gets squishy.

My old man's corrado did this too, but it ended up being a fuel pump problem. We sold that car.

 

most likely the clutch slipping

the pressure reading on the vafc is normal