I want to get rid of my cats!
04-29-2005, 11:21 PM
#1
I want to get rid of my cats! I want to ditch my cats. I am not going to get headers yet. I was planning on just cutting both of the cats off and welding in a pipe for each one. Do you know if that is possible??? Or should I just get an off road y pipe?? I want to do it the cheaper way I guess??
04-29-2005, 11:36 PM
#2
11 Second Club
Don't waste money on a y-pipe if you dno't have headers yet. You can just hollow out the cats and leave the empty shells there.
Edit: I see you have the loudmouth. Are you SURE that you don't want cats?? I would.
Edit: I see you have the loudmouth. Are you SURE that you don't want cats?? I would.
04-30-2005, 06:43 AM
#3
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With OBD 2 you will trip the MIL light and go into "limp" Mode this will actually cause a large loss of power. Using O2 sims may help( but not always) better off using a quality higl flow cat instead.
04-30-2005, 08:46 AM
#4
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you won't go into limp mode. this will only affect the after cat O2 sensors. You will get an SES but you can ignore it. I've heard that the car will sounds like crap will hollow cats.
Just do like you said and swap in some pipe.
Just do like you said and swap in some pipe.
04-30-2005, 09:33 AM
#5
I can assure you from experience that as long as you're still running stock exhaust manifolds, gutting the cats or eliminating them completely will give you 0 hp gain. Even with a 175 shot, I gained 0 hp on the dynojet. The sound of the exhaust went from refined to crappy. IMO, you should invest in headers first before you tackle messing with the cats. They are not the restriction. The manifolds are the choke point.
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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.
04-30-2005, 10:24 AM
#6
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I agree completely with what everyone said...You're car is just going to get a lot louder, but sound like absolute A$$...Unless you like a horribly raspy, poppy, unrefined sound... 
Not sure why you would want to do this...
Mike
Not sure why you would want to do this...
Mike
04-30-2005, 10:41 AM
#7
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I have no cat's on my car... but it's old,and not an ls1... It's not so bad... well, it's sounds like asscar, prolly because I was to poor to afford real mufflers and got glasspacks, and yeah, they sounded real nice at first, but, lo and be hold, got real loud... straight pipes anyone?
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04-30-2005, 12:17 PM
#9
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i had stock manifolds and a cutout and when i gutted my cats it sounded soo much better i was trying to figure out why i hadnt done that sooner ... just take em off and jam a tire iron down them till all that crap breaks up and comes out then put the shell back on it wont be raspy just noticeably louder specially if u have a cutout
04-30-2005, 12:21 PM
#10
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SLP loudmouth only really does any good sound wise if your car is stock. If you really want to see gains look at some LT's with true duals. Alot of guys including me love then sound and the gains.
04-30-2005, 12:22 PM
#11
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by the way i dont have cats with mine, but if you need to keep them you can just buy high flow carsound ones (i have a pair for sale in the sales section) or ya just hollow yours out
