High flow cats?

FIVEPOINTSEVEN · #1 (**permalink**) 03-14-2008, 10:37 AM

I decided I want to do high flow cats instead of just deleting the secondary cats and replacing with pipes...I know Magnaflow has some good high flow cats and was just wondering which other companies make them and which ones I should go with for a nice increase in sound while still having it sound good...not raspy or droney?? Thanks

FIVEPOINTSEVEN · #2 (**permalink**) 03-14-2008, 01:30 PM

C'mon I know some people on here have info on this!

Wildbill Tundra · #3 (**permalink**) 03-14-2008, 01:32 PM

dude get rid of the secondary useless cats and then replace the 1st 2 real cats with high flow...Thats how you make the power

FIVEPOINTSEVEN · #4 (**permalink**) 03-14-2008, 01:35 PM

Quote:

Originally Posted by Wildbill Tundra

dude get rid of the secondary useless cats and then replace the 1st 2 real cats with high flow...Thats how you make the power

If I did that would I still be able to plug the 02's into the high flow's and without tuning or messing with fowlers have no check engine lights??

Wildbill Tundra · #5 (**permalink**) 03-14-2008, 01:36 PM

Quote:

Originally Posted by FIVEPOINTSEVEN

If I did that would I still be able to plug the 02's into the high flow's and without tuning or messing with fowlers have no check engine lights??

high flow cats are still smog legal and yes you can plug your o2's into them...

FIVEPOINTSEVEN · #6 (**permalink**) 03-14-2008, 01:38 PM

Quote:

Originally Posted by Wildbill Tundra

high flow cats are still smog legal and yes you can plug your o2's into them...

Which high flow's would you go with?? Know any good ones? I've never really researched cats before. Thanks

Wildbill Tundra · #7 (**permalink**) 03-14-2008, 01:41 PM

Quote:

Originally Posted by FIVEPOINTSEVEN

Which high flow's would you go with?? Know any good ones? I've never really researched cats before. Thanks

its been a while man since Ive bought them or researched them. With my ws6 and my ss I had no cats. hahahah.

FIVEPOINTSEVEN · #8 (**permalink**) 03-14-2008, 01:43 PM

Quote:

Originally Posted by Wildbill Tundra

its been a while man since Ive bought them or researched them. With my ws6 and my ss I had no cats. hahahah.

Hope they were cammed...

Wildbill Tundra · #9 (**permalink**) 03-14-2008, 02:17 PM

Quote:

Originally Posted by FIVEPOINTSEVEN

Hope they were cammed...

ws6 was cammed...full boltons...12 bolt rear with 4.11's......SS was full boltons....Next car after truck is payed off will be 08+ vette

whinton · #10 (**permalink**) 03-14-2008, 02:32 PM

Not really looked into but my first place would be Random Tech to see if they have anything. Just a stab in the dark.

thumbster · #11 (**permalink**) 03-14-2008, 04:09 PM

Technically your not allowed to replace the stock cats with other ones if they're still working properly and the truck has under 80k miles on it. Just pull off the secondary ones and flange the pipe on the one longer side that doesn't have a flange yet. That way you can put the cats back on if you're unhappy with the results. I wouldn't waste my time with high flow cats. Unless you're able to tune the truck for them, you won't notice a difference. Getting rid of the small restrictive pipe outlets on the secondary cats will make a far bigger difference. When I get my longtubes put together, I will be getting rid of the secondary cats to make room for larger primary cats.

Djackman777 · #12 (**permalink**) 03-14-2008, 04:52 PM

Quote:

Originally Posted by FIVEPOINTSEVEN

C'mon I know some people on here have info on this!

Random Technology has a Round Metal Matix 7000 series high-flow cat that will wake up some of the sound. Make sure you get the pipe correct size piping.

Products

Not compatable for the first cat since its not OBD II complient and will trigger CEL. Will work for the second cat only.

Imdone · #13 (**permalink**) 03-14-2008, 05:19 PM

Usually the O2 sensors go into the pipe before or after the cats, not actually into the cats so changing them is a non-issue.

I have a pair of new un-installed 3" high flow cats that I would be more than happy to get out of my garage. I believe they are magnaflow cats and were $100 each to me.
I gladly let them go for $100 for the pair with gaskets. They have a 3 bolt flange on both ends but can be cut off or you could put a 3 bolt flange on them and run them and still be able to swap out for others.

FiveOh · #14 (**permalink**) 03-14-2008, 05:33 PM

Quote:

Originally Posted by thumbster

Technically your not allowed to replace the stock cats with other ones if they're still working properly and the truck has under 80k miles on it.

Sounds to me like someone stole his OEMs.

FIVEPOINTSEVEN · #15 (**permalink**) 03-14-2008, 05:55 PM

Quote:

Originally Posted by FiveOh

Sounds to me like someone stole his OEMs.

Somebody did steal my OEM's that's why I'm looking into high flow cat options...

Thanks for the info guys! Appreciate it!