Hi-Flow Cats

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May 2, 2003 | 04:06 PM

No_BS

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From: Southeastern PA

Hi-Flow Cats

I have a Flowmaster American Thunder system on my truck and it's not as loud as I thought it would be. Would a high flow cat make the sound any louder? Where should I go to get one and what brands are good? By the way I have a '91 F150 w/ a 302

May 5, 2003 | 04:52 PM

Hit Man X

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From: North Texas

Hi-Flow Cats

Yep nice difference in sound and you will help out fuel economy slightly too.

I installed a 3" in and out CarSound cat.

I have just one high flow cat now and passed emissions with flying colors.

May 5, 2003 | 06:15 PM

akford351

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From: AK

Hi-Flow Cats

I agree... the stock catalytic converter really muffles a lot of sound. Check out these sites for highflow cats:
www.summitracing.com
www.jegs.com

May 5, 2003 | 06:21 PM

Hit Man X

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From: North Texas

Hi-Flow Cats

Some guys sell them on ebay too. I think as Muffler Deals. I got mine for ~$75 with shipping. A great investment for power, sounds, and economy.

May 12, 2003 | 12:38 AM

ssKable

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From: baren desert wasteland, s

Hi-Flow Cats

I put magnaflow 3 inch dual exhaust on my truck and it sounded really nice, not quite as loud as i wanted, i put headers on and it didn't get any louder. I wanted to take the converters off completely but no one would do it because of the rear o2 sensors. I found some simm o2 sensors at casperselectronics.com and had the converters removed and the volume increased and now it sounds awsome. the perfomance and mileage improved as well.

May 12, 2003 | 09:04 AM

hhipp

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Hi-Flow Cats

Has anyone really researched these high flow cats? The internal ceramic catalyst has small cells that the exhaust gas passes through and every converter on the market today has 400 cells per square inch. No matter how big the inlet or outlet pipes are there is still a limited space for exhaust gas to pass through. So although these converters usually do flow better than the stock converters all the aftermarket converters should give relatively the same flow. There is one converter that just came out by Eastern and it says that it has 300 cells per square inch which actually improves flow and makes it a real high flow converter. I have seen some of the units at a trade show in NC and they look good! Has anyone else heard of these?