Sound compare, High Flow cat VS. strait pipe?
05-19-2001, 02:00 AM
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Sound compare, High Flow cat VS. strait pipe?
My current exhaust is too quiet with the stock cat. My friend has no cat and it sounds good. I dont want the pain of gettting a pipe made then having to change it for emissions, if I can just go high flow cat and get just about the same sound. Can anybody help?
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92 Firebird
305TBI, Edl.Tbi Perf.Manifold, Full exhaust, Mac muffler, air intake, 16" wheels.
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92 Firebird
305TBI, Edl.Tbi Perf.Manifold, Full exhaust, Mac muffler, air intake, 16" wheels.
05-19-2001, 01:19 PM
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Ok, I've got some experience here. I've done:
Straight Pipe
Stock OE Cat Converter
RT SHF Cat Converter
The straight pipe was the loudest with my stock exhaust. Very raspy, too.
The stock OE cat was caddy like in quiteness, but also choked off the rpms over 4800 compared to the bypass pipe.
The RT is not nearly as loud as the pipe, but, has a very nice low rumble at idle, and is acceptably loud on the highway with my 350 running at 60 mph @ 2Krpms.
I've already been complemented on the sound and they knew instantly I had a 350 L98...I hope this makes sense to you....
Straight Pipe
Stock OE Cat Converter
RT SHF Cat Converter
The straight pipe was the loudest with my stock exhaust. Very raspy, too.
The stock OE cat was caddy like in quiteness, but also choked off the rpms over 4800 compared to the bypass pipe.
The RT is not nearly as loud as the pipe, but, has a very nice low rumble at idle, and is acceptably loud on the highway with my 350 running at 60 mph @ 2Krpms.
I've already been complemented on the sound and they knew instantly I had a 350 L98...I hope this makes sense to you....
05-21-2001, 05:42 AM
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Hey Sandy,its CK,now IK here,good advice on the random tech,it flows twice the cfms as the stock cat and is damn near close to a straight pipe,i got the catco because i am a cheap skate,lol. 
05-21-2001, 10:30 AM
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Hey CK!
Yes, the Ramdom Tech from TPIS is about $225 delivered. I think the Catco is about $90. Dynomax & Walker (same maker) are between $90-130, depending on where you shop. The RT cat was rated at, I think, 542 cfm, similar to a hi performance muffler. The Random has more PGMs in it than the others (Precious Metal Group) It's a huge advantage over the stock OEM unit and a 100 or so cfm advantage over the other cats, according to my research...
Yes, the Ramdom Tech from TPIS is about $225 delivered. I think the Catco is about $90. Dynomax & Walker (same maker) are between $90-130, depending on where you shop. The RT cat was rated at, I think, 542 cfm, similar to a hi performance muffler. The Random has more PGMs in it than the others (Precious Metal Group) It's a huge advantage over the stock OEM unit and a 100 or so cfm advantage over the other cats, according to my research...
05-21-2001, 03:31 PM
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Sandy,i was looking at a test done by GMHTP and the test results in a 4th gen was nearly a doubled CFM flow,on our cars because they are way more restrictive then the 4th gens then it will surely be more then double,i am having my flows and hi-flow cat welded up in a few days,i cant wait to hear/see the results.
[This message has been edited by IROC KID (edited May 21, 2001).]
[This message has been edited by IROC KID (edited May 21, 2001).]
05-21-2001, 05:28 PM
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Car: 1986 Pontiac Trans Am
Engine: 5.0 TPI
Transmission: 700R4
After i had my Random Tech Cat welded on along with my Flowmaster, i was truly impressed with what gains i had over the stock system...both in power, and sound. My car sounds as if it has headers...and i do not
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1986 WS6-Equipped 5.0 TPI Trans Am
Random Tech High-Flow Cat
Two Chamber Flowmaster Muffler
Megs Custom 4.5" Stainless Steel Rolled Tips
1999 Grand Am GT In-Dash CD Player w/Equalizer(fits like '86 original)
5% Tint On Rear, 35% On Sides
http://www.pitt.edu/~zyhst/trans86/
OTHER RIDE:
1998 C5 6Spd. Corvette Coupe
Silver w/Gray Leather Int.
12/14 Options
Stock(for now)
Best 1/4th: 13.5 @ 104.4MPH
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1986 WS6-Equipped 5.0 TPI Trans Am
Random Tech High-Flow Cat
Two Chamber Flowmaster Muffler
Megs Custom 4.5" Stainless Steel Rolled Tips
1999 Grand Am GT In-Dash CD Player w/Equalizer(fits like '86 original)
5% Tint On Rear, 35% On Sides
http://www.pitt.edu/~zyhst/trans86/
OTHER RIDE:
1998 C5 6Spd. Corvette Coupe
Silver w/Gray Leather Int.
12/14 Options
Stock(for now)
Best 1/4th: 13.5 @ 104.4MPH
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