Choosing a Downstream High-Flow Cat

[MazdaSpeeder]

I'm trying to pull all the parts together for a probe header swap, and my SLS midpipe will have to be replaced by a custom one. I want to keep a downstream cat because I'm currently really happy with the sound of the car (with one cat...doesn't need to be any louder!). I've looked at the various magnaflow high flow cats, and other than knowing I want a 2.5 diameter, I'm at a loss for determining what cat I should get. Does anyone have any experience with magnaflow downstream cats? Recommendations appreciated!

 

[MazdaSpeeder]

bump...any suggestions?

 

[CR3 Motorsports]

PMed

 

[Fresco]

I'm currently using a vibrant performance high flow cat

 

[MazdaSpeeder]

I was thinking about one of their resonators instead...are you happy with the quality?

 

[tweety2300]

If you want to keep it as quiet as what you have now and use a high flow cat you will need to add a resonator as well, just a high flow will make it louder

 

[Fresco]

I was thinking about one of their resonators instead...are you happy with the quality?

yes sir very much, i have the stock resonator, and a vibrant performance stealth muffler(2yrs+ old) and have not had a single isssue, i have a video of it if you would like to hear it but its not a driving video just revving it...

 

[i12drivemyMP5]

I went with a Magnaflow 2.25" on my hi flo flex fitted midpipe. Was about 60.00. Have had no issues with it or inspections. Here is a 2.5" like the 2.25" one I have........

https://www.ebay.com (commissions earned)

 

[MazdaSpeeder]

Anyone have any experience with the Dynomax Bullet Race Muffler as a resonator? Looking at that along with the Magnaflow and Vibrant to keep my car from being ricey loud.

 

[msp5]

Anyone have any experience with the Dynomax Bullet Race Muffler as a resonator? Looking at that along with the Magnaflow and Vibrant to keep my car from being ricey loud.

They really don't do much for sound. there still loud as hell. I put one on my buddies mini truck and its still pretty loud

 

[MazdaSpeeder]

This would be in addition to my magnaflow cat back (it already has a muffler and resonator)

 

[Jezis]

Are you going to sell your mid pipe?

 

[MazdaSpeeder]

probably, if I can ever get this header project off the ground.

 

[rit14623]

I have the Magnaflow down-stream cat. It's the OE replacement version with the flanges and exhaust hangars welded on.
It's nice and a little bit lighter than the stock one. The angle of the exhaust flange connecting to the J-pipe was off by a couple of degrees so I had to grind the holes larger on the J-pipe's flange.