just put my catback in, and now i get a whistle (prolly intake) in fourth gear. just wondering how an exhaust can make the intake whistle, and why only in fourth.

 

How loud was your exhaust before?

 

you didnt get some of those whistletips installed did you???

 

na, i went from stock to aftermarket.....and thw whistle comes from the intake, not exhaust

 

I got the same problem with my gsr and my old ls. I think its the way the trottle body opens, because the cold air gives it more air. Dont worry about it, it might go away it might not, nothing is wrong with your car.