High flow cat
 

Are they junk or are they ok?

RE: High flow cat
 

If I stick with stock exhaust and use a high flow cat will I have gains?
I orderd a borla cat back but it has a 3 weak back order. so I am looking for somthing for now.

RE: High flow cat
 

why dont u just get a test pipe
you'll get some crazy gains but i dont think u will ever pass a smog check again

RE: High flow cat
 

I've been wanting to get a test pipe but have to pass emissions.

But was wondering if a Test Pipe is interchangeable with the cat? and how long of a process is it?

RE: High flow cat
 

Yep, you will fail emissions with a testpipe. A testpipe is a direct replacement of your CAT, it isn't that hard of a task to do, the hardest part is getting the bolts loose where it connects to the downpipe. The 3 bolts on the turbo are cake. Use lots of PB blast for the DP bolts and it should be fine. If any of the bolts wont come off the DP CAT connection dont cut the top bolt off, bad idea, the nut on the backside is welded to the cat, i spent 2 hours with vise grips turning it out. After you install it and all the bolts are fresh and free of rust, its east to remove. I just removed mine the other day along with the turbo, it took me an hour get the car on stands and remove the CAT. First time should take you 3 hours at most if everything goes ok.

RE: High flow cat
 

Ok, thats good to know. So once i get it done the first time, if i ever need to put the cat back on i will be able to, right?

RE: High flow cat
 

Yep, just take the tespipe out and through in the CAT for emissions and then once your done put the testpipe back on. Only thing you might want extra of are gaskets, just to make sure there is a tight seal.

RE: High flow cat
 

Allright, thanks for the heads up on the gaskets.