Two new Catco cats
Thread Starter
Member
Joined: Feb 2001
Posts: 129
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From: eastbay,cal.
Two new Catco cats
I had two new Catco cats installed on my car this week in place of the stock cats. The car is louder and it seems to vibrate more is this normal? Even when I just turn the key before the car actually fires up it seems different. All the welding looks perfect and this shop is known for their good exhaust work. Thanks for any info.
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SLP 1 5/8 Headers,ATR catback exhaust,SLP cold air box,Crane 1:6 roller rockers,Bosch plugs and MSD wires,MSD Coil,Fastchip,Borg Warner 9 bolt 3:27,Corvette Servo,ROH ZS 17X9.5 Goodyear GSC,s 275/40/17
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SLP 1 5/8 Headers,ATR catback exhaust,SLP cold air box,Crane 1:6 roller rockers,Bosch plugs and MSD wires,MSD Coil,Fastchip,Borg Warner 9 bolt 3:27,Corvette Servo,ROH ZS 17X9.5 Goodyear GSC,s 275/40/17
Supreme Member
Joined: Feb 2000
Posts: 1,196
Likes: 0
From: Fort Collins, Colorado
Mine got louder with the cat too. Yes, that is normal, you are hearing more of the exhaust note because you don't have a blockage in there like you did with your old cat, so the new one flows better and is louder. Mine doesn't shake though, are you sure there isn't anything touching part of the frame or something?
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.
Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET: 14.32 @ 97.7mph
(corrected for elevation)
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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.
Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.
Best ET: 14.32 @ 97.7mph
(corrected for elevation)
Junior Member
Joined: Jul 2001
Posts: 28
Likes: 0
From: Maine
Car: 91 Z28 LS Swapped
Engine: 5.3 Turbo LS
Transmission: T56 Mag
I agree also...I installed a new 3" a few days ago and definatly got alot more RUMBLE! out of it...
I think that I would check the vibration tho...on start up. Sounds like some support issues with the new sizable space it takes.
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91 5.0L Z-28
K&N Filters/air mods
Hooker Comp cat-back
Cowlinduction hood
I think that I would check the vibration tho...on start up. Sounds like some support issues with the new sizable space it takes.
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91 5.0L Z-28
K&N Filters/air mods
Hooker Comp cat-back
Cowlinduction hood
Member
Joined: Jan 2001
Posts: 218
Likes: 0
From: New York
I installed a Catco 3" in & out about 3 months ago and the heat shield already came loose and I had to reweld it. Other than that it does increase exhaust tone and flow. When I removed the heat shield from it you would really be surprised that you will pass emissions with it there really isn't much to it most of it's size is the heat shield.
Thread Starter
Member
Joined: Feb 2001
Posts: 129
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From: eastbay,cal.
Thanks for the info guys. My car came stock with dual cats 2 1/4 inlet and outlet these are 2 1/2 but the cat size is still the same.I will have to do some more checking under car to see if I see anything wrong or hitting. Taking car Thursday to get smogged hope it passes.
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