i think my cats are cloged? how can you tell if they are or not?

 

Mine would drive fine until I went wot then it would loose power. It takes about 45 minutes to unbolt the y-pipe. Then you can pull it out and look at the cats.

 

They make a pressure test gauge for testing restriction.Some muffler shops may have it.

 

If you have the stock y-pipe just unbolt it and take a look it takes all of about ten mintutes max to unbolt it. With the power you are making I would get some high flow ones anyway are just cut them off like you were talking about another thread.

 

You can also use a vacuum guage hooked in to manifold vacuum. Run the engine in P or N and observe the guage (in P it should be steady...reading will depend on the size of your cam...anywhere from 16 to 21, 22 in/hg is normal). When you snap open the throttle vacuum will go down (0 at WOT). If you hold it around 2k it should stabilize a bit. What you need to check for is when you close the throttle after holding it at 2k...the vacuum guage should jump up to over 20 in/hg after you snap the throttle shut....if it creeps up slowly, you have an exhaust restriction.

 

i have longtubes and i no ypipe. so i would have to cut em and check that way. if not i'll just go ahead and get high flow cats.

 

is there any noticeable sound. cause when i go wot it sounds to me like when it shifts into 2 i belive. i don't know how to explain the sound.

 

When my cats clogged.I could get detonation in the 5000 rpm range,and i had a no power in upper rpm range.My drivers side cat was the worst it would rattle at idle like popcorn seeds were inside.