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post #1 of 10 Old April 21st, 2019, 10:58 PM Thread Starter
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Catalytic Converter options

I have an mostly stock 03 GT and my cats are bad. What's the best route to go?
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post #2 of 10 Old April 21st, 2019, 11:35 PM
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You have emissions in your State? if not delete them. If you have to keep them try to find you some CATS from someone who deleted them so you get a good OEM product.
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post #3 of 10 Old April 22nd, 2019, 11:01 AM Thread Starter
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Originally Posted by SSG Pate View Post
You have emissions in your State? if not delete them. If you have to keep them try to find you some CATS from someone who deleted them so you get a good OEM product.
Thank you for the response.

I'm in the ATL Metro area, so yes I still need them. I honestly was a bit leery of getting them second hand because my experience with all F-L-M is that the cats go out quickly along with that damned air suspension.
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post #4 of 10 Old April 23rd, 2019, 06:16 AM
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Thank you for the response.



I'm in the ATL Metro area, so yes I still need them. I honestly was a bit leery of getting them second hand because my experience with all F-L-M is that the cats go out quickly along with that damned air suspension.
I have BBK long tubes, bbk off road H pipe and borla stingers. I ended up welding in 2.5" magnaflow cats part number 59956. They are a high flow 200 cell count stainless steel cat with a metallic core. They claim to be 49 state legal.

I went this route as I wanted a robust cat (metallic core) that is freeflowing as possible while being affordable (200 cell) and robust enough to handle boost down the road. No more exhaust fumes. The tail pipes don't get as dirty and it killed the trumpeting the stingers made. All while only killing sound levels maybe 10 percent. Plus it's from a reputable company. No issues here and happy as can be with them.

If you're just utilizing your stock mid I'd get the stock cats cut out and 2 of these magnaflows welded in. Stock piping is 2.25".

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post #5 of 10 Old April 25th, 2019, 08:17 PM Thread Starter
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I have BBK long tubes, bbk off road H pipe and borla stingers. I ended up welding in 2.5" magnaflow cats part number 59956. They are a high flow 200 cell count stainless steel cat with a metallic core. They claim to be 49 state legal.

I went this route as I wanted a robust cat (metallic core) that is freeflowing as possible while being affordable (200 cell) and robust enough to handle boost down the road. No more exhaust fumes. The tail pipes don't get as dirty and it killed the trumpeting the stingers made. All while only killing sound levels maybe 10 percent. Plus it's from a reputable company. No issues here and happy as can be with them.

If you're just utilizing your stock mid I'd get the stock cats cut out and 2 of these magnaflows welded in. Stock piping is 2.25".

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Excuse my ignorance but are you saying cut the stock ones off (4) and weld back in the(2) magnaflows?
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post #6 of 10 Old April 25th, 2019, 09:45 PM
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Quote:
Originally Posted by CYAL8R View Post
Quote:
Originally Posted by TheOdessa View Post
I have BBK long tubes, bbk off road H pipe and borla stingers. I ended up welding in 2.5" magnaflow cats part number 59956. They are a high flow 200 cell count stainless steel cat with a metallic core. They claim to be 49 state legal.

I went this route as I wanted a robust cat (metallic core) that is freeflowing as possible while being affordable (200 cell) and robust enough to handle boost down the road. No more exhaust fumes. The tail pipes don't get as dirty and it killed the trumpeting the stingers made. All while only killing sound levels maybe 10 percent. Plus it's from a reputable company. No issues here and happy as can be with them.

If you're just utilizing your stock mid I'd get the stock cats cut out and 2 of these magnaflows welded in. Stock piping is 2.25".

Sent from my SM-G920T1 using Tapatalk
Excuse my ignorance but are you saying cut the stock ones off (4) and weld back in the(2) magnaflows?
The main cats are the rear, the fronts are precats.
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post #7 of 10 Old May 4th, 2019, 12:22 PM
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If it’s legal in your state, you might as well get an aftermarket catted x pipe and enjoy a power gain going from 2.25” to 2.5” pipes. I’ve had a magnaflow catted x since 2003 and still pass smog without issue.

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post #8 of 10 Old Yesterday, 11:48 AM
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Quote:
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Thank you for the response.



I'm in the ATL Metro area, so yes I still need them. I honestly was a bit leery of getting them second hand because my experience with all F-L-M is that the cats go out quickly along with that damned air suspension.
I have BBK long tubes, bbk off road H pipe and borla stingers. I ended up welding in 2.5" magnaflow cats part number 59956. They are a high flow 200 cell count stainless steel cat with a metallic core. They claim to be 49 state legal.

I went this route as I wanted a robust cat (metallic core) that is freeflowing as possible while being affordable (200 cell) and robust enough to handle boost down the road. No more exhaust fumes. The tail pipes don't get as dirty and it killed the trumpeting the stingers made. All while only killing sound levels maybe 10 percent. Plus it's from a reputable company. No issues here and happy as can be with them.

If you're just utilizing your stock mid I'd get the stock cats cut out and 2 of these magnaflows welded in. Stock piping is 2.25".

Sent from my SM-G920T1 using Tapatalk
Hey man, ya gotta picture of that? I have longtubes and I don't think I have the real estate to put highflow cats on. Mainly just wanna get rid of smell.


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post #9 of 10 Old Yesterday, 07:36 PM
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Quote:
Originally Posted by TheOdessa View Post
I have BBK long tubes, bbk off road H pipe and borla stingers. I ended up welding in 2.5" magnaflow cats part number 59956. They are a high flow 200 cell count stainless steel cat with a metallic core. They claim to be 49 state legal.

I went this route as I wanted a robust cat (metallic core) that is freeflowing as possible while being affordable (200 cell) and robust enough to handle boost down the road. No more exhaust fumes. The tail pipes don't get as dirty and it killed the trumpeting the stingers made. All while only killing sound levels maybe 10 percent. Plus it's from a reputable company. No issues here and happy as can be with them.

If you're just utilizing your stock mid I'd get the stock cats cut out and 2 of these magnaflows welded in. Stock piping is 2.25".

Sent from my SM-G920T1 using Tapatalk
I have BBK long tubes with a BBK high flow x-pipe. It had Flowmaster mufflers. Flowmasters drone. The drone was loudest between 1800-2200 rpm (cruising speed). I finally got to a point where I couldn't stand it. I had the Flowmaster mufflers cut out and Magnaflows welded in. Sounds great.

The only problem I have is an occasional check engine light and a slow to heat failure. That is because the sensors have been moved farther back.

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post #10 of 10 Old Today, 08:17 AM
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Here are some options for you. Got an email that they are running 10% off for Memorial Day.

https://www.jegs.com/c/Exhaust-Syste...0002&langId=-1
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