[dsddcd]

I have been trying to search but every time I do it returns null values.

Not too long I will be installing a Magnuson on a 2018 SS and would like to install high flow cats at the same time. I am struggling to locate a bolt on high flow converter option. Since I am a terrible fabricator it would be nice to purchase something and bolt it on. Does anyone have any leads to a company that might have a nice bolt on solution?

[Ventmaster]

I know I'm comparing apples to oranges but I had (what was generally accepted as top, high flow cats made by Solo that bolted right up to the stock position on a 2010 Camaro RS- that's right a V6. I had also replaced the archaic OE exhaust manifolds on the V6 with a quality set of "shorty" headers) a ProCharger centrifugal supercharger installed and tuned by IPF in Tempe, AZ and in the matter of 2 days it melted the cats to the point they plugged the engine so badly that the motor did a melt down.

The up side was they still had possession of the car, so there was no one else, really to blame. In their defense, after we were unable to successfully install the S/C in 4 days, they graciously paid to fly me home in time for work. Downside was it took 6 months to get my car back and that created some stress as you can imagine.

Upside was without cats it ran great! Made more HP at the rear wheels than a stock LS V8 engine in the 5th Gen. Camaro.

I only mention this because our new 6.2 liter V8's benefit from the tech that made the V-6's so good (variable valve timing, direct injection and resulting higher compression, etc...). So I figure higher exhaust temps are a given. More HP = more heat.

I would advise you to review the "Forced Induction Discussions" forum on current thinking in regard to aftermarket Magnuson installation and catalytic converters that are compatible.

After I got tired of the "raw gas" smell that results from a no cat set-up, I put the OE cats back on my V6 and they worked very well (5 years but not alot of miles- probably 15K miles). Then I sold it to raise a down payment on my '17 SS. Of course it had a back-up set of lightly used ZL1 cats in the trunk.

Sorry for all the un-needed detail but I hope it was helpful. And have fun with your project! My advice would be to drop the 2nd cat but keep the primary if your state has relaxed laws regarding emissions. If they are not, just keep the stock cats and don't worry- damn car is gonna make more power than you can put to the ground anyway!

[ST1LE]

Sadly I do not think what you're looking for exists. There are only two aftermarket brands that I know that make hi-flow cats that can handle a supercharged motor, and that's GESI and Kooks. Neither make a setup that will bolt up to stock Camaro manifolds.

[cmitchell17]

I want to do this same thing. I hate the unburnt fuel smell and want to replace the stock primary with a "high flow".

There was a member on here who cut the stock primary cats out of the downpipe and welded in some I think GESI cats. But of course he made a jig to do it.

I have been trying to look for some GESI cats for my truck but apparently you can't get them right now with all the other supply chain apocalypse going on. You can get the standard ones but not the uho ultra high output ones.

[6spdhyperblue]

Is there still smell with only secondary cats?

[laynlo15]

I think you'll be wasting time and money on your project. I ran 10.00@139 with full stock exhaust on my 16 SS with Magnuson 2300, the motor was also bone stock. GM really built a pretty high flowing exhaust and when I did build a new motor over that winter I went to long tubes with high flow cats and 2650 Maggie. The problem we had was that the high flow cats clogged up and about destroyed the new motor. Don't waste your money, leave the stock cats on it.

[6spdhyperblue]

I agree. With NA you can really make use of the extra scavenging to clear the chamber out. When you have that compressor, you have a lot more to work with.

I don’t know much about boosting these motors but with the blower Id really be looking for ways to safely lean it out, you don’t want to do that with cats anyway right?

Is your hp going to limited by fuel?

[KingLT1]

Originally Posted by 6spdhyperblue

Is there still smell with only secondary cats?

I ran my car that way for 3 years and the secondary cats really helped the exhaust smell. Wasn't much different then stock.

[cmitchell17]

Originally Posted by 6spdhyperblue

Is there still smell with only secondary cats?

When I tried only the second ones, the smell was pretty bad, basically the same as no cats at all. But I've never tried just running the primaries. People say only the primaries are a restriction and the secondaries aren't but I've never tested it.

I do think the "gains" with long tube headers are mostly just in removing the primary cats.

I think the secondaries aren't really used at all to react unburnt fuel.

[KingLT1]

Originally Posted by cmitchell17

When I tried only the second ones, the smell was pretty bad, basically the same as no cats at all. But I've never tried just running the primaries. People say only the primaries are a restriction and the secondaries aren't but I've never tested it.

I do think the "gains" with long tube headers are mostly just in removing the primary cats.

I think the secondaries aren't really used at all to react unburnt fuel.

On a stock cam car it's not even close. Secondarys filter out a lot of stink. You had heads/cam setup?

[cmitchell17]

Originally Posted by KingLT1

On a stock cam car it's not even close. Secondarys filter out a lot of stink. You had heads/cam setup?

Yes I did when I took the primary ones off. But then again I notice it probably way more than anyone else haha.

[laynlo15]

Switch to E85 and that will help some but you'll have to do some fueling upgrades with the 2650 Maggie

[Spaceme1117]

Originally Posted by dsddcd

I have been trying to search but every time I do it returns null values.

Not too long I will be installing a Magnuson on a 2018 SS and would like to install high flow cats at the same time. I am struggling to locate a bolt on high flow converter option. Since I am a terrible fabricator it would be nice to purchase something and bolt it on. Does anyone have any leads to a company that might have a nice bolt on solution?

As far as I know, a bolt on high flow cat for the stock exhaust does not exist.

If you can, you really should go with headers and hi flow cats. The stock exhaust will have a good bit of back pressure.

[KingLT1]

I will add that if you do buy aftermarket cats make sure to get GESI gen 2.