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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 01-12-2012, 02:12 AM   #1
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High Flow Cats? Y/N?

Alright, once I thought I new exactly what I was going to do I realized I had no clue. I want that deep throaty exhaust sound which has made me look at either Borla Atak or the Solo Performance Mach XL with J Pipes. So my question is when I decide to install one of these two systems is it worth my time and money to replace the stock cats with some high flow cats? Whats the advantages or disadvantages? From what I have gathered is that High Flows just make your system sound a little louder and doesn't restrict the air flow as much as the stocks? Is their any real reason why I should replace these while puting in a cat back system?
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Old 01-12-2012, 02:19 AM   #2
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Either get hi flow cats or offroad. Stock cats suck.

But the difference between hi flow and offroad is minimal. Ted tested it out and found nearly no difference. It's purely to meet regulation standards. If your state doesn't care or you live out of country go ahead and get some offroads.

If you plan on forced induction, get offroads also.
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Old 01-12-2012, 05:43 AM   #3
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What he said. I live in NC so I have to have cats. I put on the Solo hi flows and it's a huge difference.
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Old 01-12-2012, 07:52 AM   #4
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Old 01-12-2012, 08:22 AM   #5
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Not with forced induction!
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Old 01-12-2012, 08:23 AM   #6
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What he said. I live in NC so I have to have cats. I put on the Solo hi flows and it's a huge difference.
Gut them

I live in NC also
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Old 01-12-2012, 08:35 AM   #7
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Leave the stock exhaust and install Solo Hi Flow cats. The sound will change dramatically and may be exactly what you are looking for PLUS you'll pick up some power. Then if you have to have it louder you can install an aftermarket exhaust which will show no or minimal gains in power behind a stock engine.
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Old 01-12-2012, 10:33 AM   #8
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But the difference between hi flow and offroad is minimal. Ted tested it out and found nearly no difference. It's purely to meet regulation standards. If your state doesn't care or you live out of country go ahead and get some offroads.
This is correct but might be slightly confusing. The difference between HF cats and offroad is minimal but the difference between OEM cats and HF cats (or offroad) is significant. Some have shown 15-20 rwhp gains over just chaning the OEM cats to HF cats.

Changing to HF cats will also change the sound of your car as well. So, a Borla ATAK might sound good to you with OEM cats but then with HF cats it might be too loud.

If you're planning on doing LT headers eventually, I would tell you to just save your money. I wouldn't even do a cat-back until then either....again, because the sound will change with LTs. If you're looking for some temporary sound look into doing a muffler delete. That is cheap but will sound much better than the factory mufflers. Save your money and do LTs/Cat-back/Tune all at the same time.

There are alot more inexpensive LT options out there now. Stainless Works has some, OBX, XS Power, TX Speed. IMO you'll be better off happier with something like that than just HF cats.

I think XS Power had their complete system (LTs and Cat-back) for like $650 during the Holidays. Normally I think you can get it for about $750. You'll spend probably half of that on just the HF cats.
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Old 01-12-2012, 11:04 AM   #9
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Leave the stock exhaust and install Solo Hi Flow cats. The sound will change dramatically and may be exactly what you are looking for PLUS you'll pick up some power. Then if you have to have it louder you can install an aftermarket exhaust which will show no or minimal gains in power behind a stock engine.
Ed M.
I also recommend this approach until you get your headers if that's the goal. Don't waste $1000 on exhaust when $400 on high-flows will give you a larger performance boost and change the exhaust volume significantly. Once you get headers, you'll have to have the cats cut and possibly welded, but compared to the header install and tune price, that should be a minimal cost.
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Old 01-12-2012, 11:39 AM   #10
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Originally Posted by flht99b View Post
Leave the stock exhaust and install Solo Hi Flow cats. The sound will change dramatically and may be exactly what you are looking for PLUS you'll pick up some power. Then if you have to have it louder you can install an aftermarket exhaust which will show no or minimal gains in power behind a stock engine.
Ed M.
I made the assumption and perhaps incorrectly the OP was keeping his stock exhaust manifolds. With stock manifolds or shorty headers the high flow cats are the way to go. If the long term goal is long tube headers, save you $$ and do LT's and the appropriate HF cats or cat delete at the same time and I would still use the stock cat back exhaust UNLESS heavy duty, major internal engine modifications are planned for the future. See my sig, mild engine mods, LT's, HF cats, stock cat back pipes ( with OEM resonators intact ) and a GMPP touring axle back. The GMPP axle back does nothing but improve the sound quality ( made it deeper ), shed weight and looks better. I don't believe the GMPP or Borla equivalent and probably others flow any better than the OEM "potato sack" mufflers, they just weigh less, look better and change the "tone". My set up has a great sound ( deeper and louder than stock BUT not overly so ), doesn't drone and does not tire me on a 400+ mile trip. Even my wife ( who drives a dead quiet Caddy ) thinks it sounds good and isn't too loud in the cabin. Full throttle application is a different story though .
It all boils down to what you want from the car and what you are willing to put up with and or spend to get there.
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Old 01-12-2012, 11:42 AM   #11
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Since I am a little more privy to your goals, I would wait and get the HF cats later with your headers. If you do it now, yes you would experience power gain, but would be limited mainly to the Solo brand and one other-else a CEL. If you wait till the headers, then you will have more manufacturer options and maybe any easier piping setup. The power gained from the HF cats have been shown to be more than those from the cat back exhaust changeout. If you ever go S chrgr, then there are some lower quality cats you should avoid.
I'd agree, if you ever plan on going with long tube headers, wait till then to get cats, for the price its not worth doing it twice.

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Old 01-12-2012, 12:55 PM   #12
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My JBA High-Flow Cats showed significant horsepower gains at the track.

I plan on using them and the JBA Shorties with my ProCharger D1 build that begins today. I expect my JBA high-flows to hold up fine with a supercharger, though other brands have failed.

But for your goals, you'll love high-flow cats.

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Old 01-12-2012, 01:06 PM   #13
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Solo cats have been one of the best mods yet.
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Old 01-12-2012, 01:23 PM   #14
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My JBA mids made my exhaust sound amazing and you can make over 400rwhp pretty easy with them.
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Old 01-12-2012, 09:37 PM   #15
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Very interesting. I am debating HF cats right now as well. I can't decide whether or not to get them with my LT
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Old 01-14-2012, 08:39 AM   #16
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Just with a CAI, Solo hi flows and muffler delete I put down 394 rwhp and 399 ft lbs. I was hoping for more but 22" rims killed me.
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Old 01-14-2012, 09:16 AM   #17
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Here are my mods. Solo Hi flow cats and a borla atak cat back.
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