Punching out a HF cat - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

caverman · 02-11-2012, 01:29 PM

Has anyone ever punched out the inside of a HF cat to make it straight through? If so, how hard was it to do and any suggestions on how to get it out?

geaux_tigerss · 02-11-2012, 01:36 PM

I did this with a Honda a few years back. Long screwdriver and hammer. Took all of ten minutes. It breaks apart like glass and comes out in big chunks.

mikeSS · 02-11-2012, 02:10 PM

there was a few people on this thread about cats that did it.
http://www.camaro5.com/forums/showth...183230&page=14

i heard you need a re-tune if you do this. but not 100% sure

JHart · 02-11-2012, 02:39 PM

yeah just a screwdriver-prybar and a hammer. make sure it all scrapes out. did this a dozen times probably. it's a free mod to feel a little power gain in a stock vehicle too.

IndeedSS1 · 02-11-2012, 02:47 PM

SOLO high flow cats are stainless wound and welded in several loctions. Not sure they will gut that easily.

caverman · 02-11-2012, 05:52 PM

Thanks guys. Got it out.

A long chisel, a big shop hammer, and about 15 min or so.

TCAT · 02-11-2012, 06:09 PM

How do you ensure all the pieces or remnants are out of the cat??? Will there be any left along the wall of the cat? Thanks

geaux_tigerss · 02-11-2012, 06:20 PM

Just looking down in it. Does it really matter if a few pieces are left as long as they're attached? The only danger is a muffler rattle.

TCAT · 02-11-2012, 06:25 PM

Yeah, you can definitely get a good idea of what's left by looking down it. I was more worried about the turbocharger of mine getting damaged somehow if possible. Hopefully any left over pieces would blow out easily out the rear of the exhaust.

caverman · 02-11-2012, 06:35 PM

You can see right down through the cat. The inside of these were not welded so it spun inside the cat. I took some effort and even though it was only about 15 min it was a long 15 min.

TCAT · 02-11-2012, 07:18 PM

Awe gotcha, that makes sense. Sorry, I thought you had midpipes with high flow cats. I didn't read that you hae long tubes. The JBA's I have are harder to look inside and the inside can't be as easily reached.

mikeSS · 02-11-2012, 07:35 PM

so why did you go non catted ?

RANGERGOD · 02-11-2012, 07:42 PM

Why not just remove the cats completely?

mikeSS · 02-11-2012, 07:44 PM

Quote:

Originally Posted by RANGERGOD

Why not just remove the cats completely?

he did... there is no cats on his car. its also cheaper to do it this way.

02-11-2012, 01:29 PM	#1
caverman Drives: '69 SS Convertible Join Date: May 2009 Location: DFW, TX Posts: 7,111	Punching out a HF cat Has anyone ever punched out the inside of a HF cat to make it straight through? If so, how hard was it to do and any suggestions on how to get it out? __________________ *-2010 Camaro* 2SS \| M6 \| VR w/White Stripes \| 1 3/4" KOOKS - 3" Magnaflow \| LPE 3.91 gears \| ADM tuned \| Halltech w/ADM Scoop \| Spohn/BMR Trailing Arm/Toe Rod \| BC Coilovers\| Pedders FE4 ZL1 swaybars \| Cradle/Diff/Radius Rod bushings \| VMax TB \| Morimoto Projectors \| MGW shifter \| Red Calipers Build Journal

02-11-2012, 01:36 PM	#2
geaux_tigerss Drives: 2019 GMC Sierra 1500 AT4 Join Date: Nov 2011 Location: Orange, TX Posts: 740	I did this with a Honda a few years back. Long screwdriver and hammer. Took all of ten minutes. It breaks apart like glass and comes out in big chunks. __________________ 2019 GMC Sierra 1500 AT4 Summit White 6" Lift, 37x13.50R24's

02-11-2012, 02:39 PM	#4
JHart I haz camaro again :) Drives: 2010 Chevrolet Camaro 1SS Join Date: Mar 2009 Location: Union, South Carolina Posts: 660	yeah just a screwdriver-prybar and a hammer. make sure it all scrapes out. did this a dozen times probably. it's a free mod to feel a little power gain in a stock vehicle too. __________________ 2010 Camaro 1SS(back in a camaro again, yessssss!) 2010 silverado z71 ccsb(sold, old dd) 2010 camaro1ss(sold, missed, will have another someday)

02-11-2012, 02:47 PM	#5
IndeedSS1 Drives: 2010 Camaro SS LS3 Join Date: Sep 2010 Location: Eastern MO Posts: 3,786	SOLO high flow cats are stainless wound and welded in several loctions. Not sure they will gut that easily. __________________ She is only memory now.

02-11-2012, 05:52 PM	#6
caverman Drives: '69 SS Convertible Join Date: May 2009 Location: DFW, TX Posts: 7,111	Thanks guys. Got it out. A long chisel, a big shop hammer, and about 15 min or so. __________________ *-2010 Camaro* 2SS \| M6 \| VR w/White Stripes \| 1 3/4" KOOKS - 3" Magnaflow \| LPE 3.91 gears \| ADM tuned \| Halltech w/ADM Scoop \| Spohn/BMR Trailing Arm/Toe Rod \| BC Coilovers\| Pedders FE4 ZL1 swaybars \| Cradle/Diff/Radius Rod bushings \| VMax TB \| Morimoto Projectors \| MGW shifter \| Red Calipers Build Journal

02-11-2012, 02:10 PM	#3
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	there was a few people on this thread about cats that did it. http://www.camaro5.com/forums/showth...183230&page=14 i heard you need a re-tune if you do this. but not 100% sure

02-11-2012, 06:09 PM	#7
TCAT Drives: Has Wheels Join Date: May 2011 Location: On Earth Posts: 5,553	How do you ensure all the pieces or remnants are out of the cat??? Will there be any left along the wall of the cat? Thanks

02-11-2012, 06:20 PM	#8
geaux_tigerss Drives: 2019 GMC Sierra 1500 AT4 Join Date: Nov 2011 Location: Orange, TX Posts: 740	Just looking down in it. Does it really matter if a few pieces are left as long as they're attached? The only danger is a muffler rattle. __________________ 2019 GMC Sierra 1500 AT4 Summit White 6" Lift, 37x13.50R24's

02-11-2012, 06:25 PM	#9
TCAT Drives: Has Wheels Join Date: May 2011 Location: On Earth Posts: 5,553	Yeah, you can definitely get a good idea of what's left by looking down it. I was more worried about the turbocharger of mine getting damaged somehow if possible. Hopefully any left over pieces would blow out easily out the rear of the exhaust.

02-11-2012, 06:35 PM	#10
caverman Drives: '69 SS Convertible Join Date: May 2009 Location: DFW, TX Posts: 7,111	You can see right down through the cat. The inside of these were not welded so it spun inside the cat. I took some effort and even though it was only about 15 min it was a long 15 min. Attached Images __________________ *-2010 Camaro* 2SS \| M6 \| VR w/White Stripes \| 1 3/4" KOOKS - 3" Magnaflow \| LPE 3.91 gears \| ADM tuned \| Halltech w/ADM Scoop \| Spohn/BMR Trailing Arm/Toe Rod \| BC Coilovers\| Pedders FE4 ZL1 swaybars \| Cradle/Diff/Radius Rod bushings \| VMax TB \| Morimoto Projectors \| MGW shifter \| Red Calipers Build Journal

02-11-2012, 07:18 PM	#11
TCAT Drives: Has Wheels Join Date: May 2011 Location: On Earth Posts: 5,553	Awe gotcha, that makes sense. Sorry, I thought you had midpipes with high flow cats. I didn't read that you hae long tubes. The JBA's I have are harder to look inside and the inside can't be as easily reached.

02-11-2012, 07:35 PM	#12
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	so why did you go non catted ?

02-11-2012, 07:42 PM	#13
RANGERGOD IDBZ M.C. Drives: 12' IOM, 2SS, LS3 Join Date: Feb 2012 Location: Columbus, Ga. Posts: 562	Why not just remove the cats completely? __________________

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