Cats or no cats?
12-31-2005, 06:50 AM
#1
Staging Lane
Thread Starter
Cats or no cats? I have a 99 ecsb silverado with a 5.3. I am considering removing the cats and am looking for some advive. My current mods consist of hypertech programer, true dual 2.5 inch magnaflows, and a K&N FIPK. I was wondering If i remove the cats will I need to install O2 simulators to keep the computer from throughing codes. I would like to keep the hypertech programer because I like the fact that I can adjust for tires and all my self. Any info would be great. 
12-31-2005, 07:52 AM
#3
If you're still running stock exhaust manifolds, be advised that removing the cats will yield 0 rwhp increase. The manifolds are a big restriction in the system and the factory cats outflow the catback. So basically, you'd be removing the highest flowing part of the exhaust and replacing it with a straight pipe. That's why there's no gain.
Now if you had headers, then the cats would become a restriction, but on a mild 5.3L, they'd only cost you 3-4 rwhp at the most.
Now if you had headers, then the cats would become a restriction, but on a mild 5.3L, they'd only cost you 3-4 rwhp at the most.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
