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03-11-2009, 02:31 PM #1
Will a Flowmaster/K&N hekp with stock cat?
Vehicle is a'96 burb 2500/4x4 454... Ive read if I emiminate the cat, then mpg will suffer (due to O2 sensor)...??
I did that on a Jeep, and it didnt hurt mpg. Dont want to spend a lot, just wondering if I should:
1) add Flowmaster & K&N
2) Get rid of cat and do #1
3) Add aftermarket cat, Flowmaster, and K&N
Im looking to increase HIGHWAY mpg, not concerned with town or torgue...I think the 454 has it . Dont want to spend a lot or get into heavy mods...this is probably all I will do.
Last edited by omnisi; 03-11-2009 at 07:35 PM.Semper Fi :fighting0037:
1990 1500 Suburban 6.2L Diesel 4x4
03-11-2009, 02:45 PM #2
Will a Flowmaster/K&N help with stocl cat
What year Suburban? If its 96 and newer it has before and after o2s. Keep your cat if its good (96 up will show code if bad). I would add K&N with the Flowmaster.If your cat is bad replace with high flow cat. If your truck is 95 and older it will not show a bad cat code. Have exhaust shop check the cat.If it has over 100,000 miles on it, than I would change the cat.
03-11-2009, 02:53 PM #3
I would do #2 and anything but a K&N filter. I would go with a AirRaid, AFE or S&B. 10 times better filter. Here is a good read on air filters. http://duramax-diesel.com/spicer/index.htm02 Chevy Suburban 1500, 4:10 Difs, Stock for now.
02, CC, LB, 4x4, LB7, 145K Miles, EFI Live Tuned by Nick at Duramaxtuner, Banks Ram-Air w/ superscoop (Plate Removed), Banks Big Head, AirDog 100, Pillar Gauges, 16x8 Eagle wheels, 285 BFGs, Bilstein 5100's, Ride Rite Air Bags 5" Exhaust, 4" downpipe, Prodigy Brake Controller, Goose Neck.
02 Grand Prix GT.
03-11-2009, 06:12 PM #4
If it's 95 or older, you can always take the cat off and knock the guts out of it, then reinstall it. Keeps the inspectors happy. ;)
03-11-2009, 07:20 PM #5
- Join Date
- Feb 2008
I'd leave the cat, too. I think the cai & flowmaster are good choices, but don't count on much of a difference in MPG. You might take out the back seats and eliminate as much weight as possible. A fresh coat of wax might help w/ wind resistance (just kidding w/ that one)
03-11-2009, 07:28 PM #6
I personally like #3 if the stock cat is bad. If it isn't, I would have to think about whether I want to replace a perfectly good cat or not.
As far as MPG goes, I'm not sure. If it's an OBD II vehicle, than it will have before and after cat O2 sensors which will throw a code. I have heard that some vehicles will add more fuel just because of a code in the ECU, not sure if the GM's do it or not. I could also see the ECU adding fuel to the motor because it won't know whether it's running too lean, or too rich or what.
03-11-2009, 07:41 PM #7
Its a '96 with 132K miles. I used the terms "K&N" and "flowmaster" in a generic sense.
How much are the high flow cats now?....
Most importantly, I guess i need to know if eliminating the cat will make fuel usage worse...I can stand the dash light for the O2 sensor...just dont want to burn more fuel..
03-11-2009, 11:50 PM #899 Silverado Z71 4.8
2" Suspension lift (Add-a-leafs and leveling keys)
Long tube headers with 3" offroad Y-Pipe
Volant Cold Air Intake with Ram Air Intake Tube
Jet Mass Air Flow Sensor
Diablosport Predator Tuner
97 Suburban K1500
3" Body lift
2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
35" Yokohama M/T's
Airraid Throttle Body Spacer
03-12-2009, 12:03 AM #9
Man be nice to the enviroment put high flow cats on and you will get the same reasults as cutting them off. Plus they make it sound nice to.
03-12-2009, 11:20 AM #10
Can also get an O2 sensor fooler. No personal experience with them, but have heard they work.
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