Ive had my s4 for about a month now and I love it But Im having Boost issues??
Im pretty sure its going to be the Throtttle Body boot But Im unsure. I Seem to lag here and there while drivin on the highway and I punch it. I hit like 4500rpms and It starts spuddering and Not getting Up to speed the way its suppose to Any insight?? I have a K&N Drop in and an AWE exhaust?? Dont know if Its causesing the problem??

 

Checking the TBB is easy. Just pull off the biturbo cover in the front, loosen a couple of screws and it's off.

 

buy a Pressure tester and you can check the system for boost leaks. You should do this every other oil change

 

WHY DON'T YOU REMOVE THE PLASTIC COVER & LOOK AT IT?

If not, your turbo's are not going to last long. About the worst thing you can do is push the car with a boost leak.