The only difficulty with the install is the air pump line, but overall not too difficult. It bolts straight up, and all you have to do with the air pump line is saw the original metal line off the stock cat...it's bigger in diameter than the inlet welded to the gotham cat, so slide it over top the inlet piece (if you need to bend the inlet at all just torch it for a few seconds move it the way you need and weld it in place, and bolt the original air pump back together and you're done

It sounds really good...little deeper at idle, but not much, it's once you hit boost that it really sounds different...makes the 7 scream...over throttle respone is much better, and the turbos spool a lot quicker...pulls a lot harder too without that stock cat, and not to mention probably weighs 20-30 lbs. less than the stock one

 

I didn't cut anything when I did my install. I just got some correct sized hose from the local autozone and some good hose clamps. Took all of 5 minutes to measure/cut the hose and then install it.

GEB.

 

Glad you like it. That stock main cat weights a ton.....back a few years ago when I swapped in a midpipe in my garage, the damn main cat almost fell on my head. That would've hurt like a **** .

 

question: for those that doesnt have the airpump, will the HiFlow Cat work?? will it shorthen its life?

 

Yes.

 

Might want to check that hose periodically; I can't imagine it withstanding the intense heat from the cat for very long...

 

Yeah this is why we thought it would be best to weld the piece rather than find some hose...1000+ degrees is a little warm for some hose

 

im just gona gut my cat when i get a pfc.

 

Just buy a midpipe. Gutting the cat is not nearly as good an option for two reasons. One, because the cat is much wider than the reast of the piping, you're going to have a lot of turbulence, slowing down airflow, increasing lag time, and it's going to cause less HP than just a midpipe. Two, it's still a lot of metal (weight), and it is ooooold.

Just my 4.5¢

 

four point five cents, huh ?

I completely agree. A midpipe is inexpensive and a much better choice then gutting the cat. There is are some situations where you can and should save $$ when modding, and this definitely isn't one of them.

My 7.9 cents

 

do you mean it will shortenthe life of the hiflow cat?? so i have to put back my airpump then, if i go to that route? tanx

 

Without the airpump the cat will not get a enough airflow underneath certain RPM's and will begin to clog. The cat will still work, but the life will be shorter...

 

No one *really* knows how much shorter the life span of the cat will be. What we need is some brave soul, a pioneer, a Louis and Clark, to volunteer their high flow for the task.....are you that intrepid man ?

 

I'm stickin with my airpump, but I talked to a guy at a muffler shop near my school who knows his stuff, and said that without the airpump there is not enough air flow through the cat to allow the catalyst to do its job and convert the exhaust gases into more environmentally safe ones... so I would say from that, that your cat won't do its job without proper air flow and will begin to clog, but not as fast as the stock one considering it has less restriction allowing for more air flow

 

i didnt know that! i just assume that ONLY the stock cat needs the extra air to have a cleaner and environmentally safe gas... tanx for the info... i learn something everyday... but till i have the $$$ for a HiFlow, i'll just leave the airpump off...