Which HF cats to use with Speed Engineering LTs? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

oslouie · 09-05-2017, 06:15 PM

Plan to order a set soon. For those of you who went catted, which HF cats did you end up purchasing?

who-dat · 09-05-2017, 06:49 PM

I didn't go with cats, but most go with Texas Speed. You have to call them to order their HF cats I believe

Aaron0731 · 09-05-2017, 06:58 PM

Bought headers and want cats but didn't buy cats with the headers? Consider me lost

SSteven · 09-05-2017, 06:59 PM

Texas Speed. Cost as much as your headers (300/pair plus shipping), but were a direct bolt on

Sent from my SM-T713 using Tapatalk

pyroguy · 09-05-2017, 07:11 PM

You might as well go with Texas Speed headers if you're going catted. The cost is almost identical and you might as well buy it all at one place instead of piecing it together to spend basically the same amount of money.

Gunmetal Speedster · 09-05-2017, 07:17 PM

Quote:

Originally Posted by Aaron0731

Bought headers and want cats but didn't buy cats with the headers? Consider me lost

Speed Engineering doesn't offer high flow cats, if you want them you'll have to outsource.

Quote:

Originally Posted by pyroguy

You might as well go with Texas Speed headers if you're going catted. The cost is almost identical and you might as well buy it all at one place instead of piecing it together to spend basically the same amount of money.

^^^ This.

christianchevell · 09-05-2017, 07:41 PM

I think my stainless power were about $200 and work good. Your end of your headers matters in what you buy if you have flanged or other non normal headers to match up to the stock exhaust with 2 1/2 " diameter , and of course you would need to fit and cut and strap in the HFCs and replace the O2s into them though they are disabled, most likely your round and not flanged and ready to match up to HFC, just needing to shorten the 2 1/2 "exhaust. It appears they sell a 3 to 2 connection just no cats and they are about the size of HFCs and the shape...... https://www.speed-engineering.com/sh...ton-pipes.html Good Luck, I do not see a merge spike a nice feature listed in their design either.. You also may want to buy a set with a tune for the car which will be needed to disable the back cats and a code of delayed response from the fronts while at the same time being able to change other parameters like fan temp on, a 160 degree thermostat to go with headers usually, and torque management of dealing with other things like 1-4 shift idling low or hill start etc and of course if a good tune some AFR remapping etc.... Places of I can think of....Steve at RDP or Jannetty racing, more places all over like Livernois or Lingenfeltrers, Phastek maybe even or etc etc etc And if you get the tune you will avoid the dreaded CEL until done....check engine light..... and codes thrown which need the tune and can seriously make a auto trans shift better.

Angie11 · 09-06-2017, 09:42 AM

I got some from Magna flo that work well and very nice $.....search ebay

xc_SS/RS · 09-06-2017, 11:44 AM

Eastern Catalytic 79130 slipped right onto the ends of my speed engineering long tubes and they're 150 for a pair and it was $50 to get reducers welded on to bolt up the 2.5" exhaust. can't beat it!

Leo72793 · 09-06-2017, 07:34 PM

Quote:

Originally Posted by xc_SS/RS

Eastern Catalytic 79130 slipped right onto the ends of my speed engineering long tubes and they're 150 for a pair and it was $50 to get reducers welded on to bolt up the 2.5" exhaust. can't beat it!

wonder how well these will work

https://www.amazon.com/dp/B0085UDUQ8..._t1_B0018R9L18

camrytt · 09-06-2017, 08:29 PM

Contact a local muffler shop and see if they can make some. Henry's muffler in NC made my high flows, installed for about 350

xc_SS/RS · 09-07-2017, 09:15 AM

Quote:

Originally Posted by Leo72793

wonder how well these will work

https://www.amazon.com/dp/B0085UDUQ8..._t1_B0018R9L18

could work well, but some reviewers mention the internals coming loose. i dont know if metallic cats are more robust than ceramic, but I have metallic cats as they offered less restriction.

oslouie · 09-07-2017, 07:13 PM

Probably gonna end up getting these:

https://www.amazon.com/MagnaFlow-599...NEY3TSC918W2YX

They are 200 cell converters.

Leo72793 · 09-14-2017, 10:04 AM

Quote:

Originally Posted by oslouie

Probably gonna end up getting these:

https://www.amazon.com/MagnaFlow-599...NEY3TSC918W2YX

They are 200 cell converters.

ive looked at those. im keeping 2.5" exhaust so id probably have to get weld in adaptors. I want to use flanges or clamps. not sure yet

09-05-2017, 06:15 PM	#1
oslouie Drives: 2018 2SS M6 Redline Join Date: Oct 2014 Location: United States Posts: 431	Which HF cats to use with Speed Engineering LTs? Plan to order a set soon. For those of you who went catted, which HF cats did you end up purchasing?

09-05-2017, 06:59 PM	#4
SSteven Drives: 2013 ZL1 Black Join Date: Aug 2013 Location: Dallas Posts: 411	Texas Speed. Cost as much as your headers (300/pair plus shipping), but were a direct bolt on Sent from my SM-T713 using Tapatalk __________________ 2013 ZL1 (purchased 3/2017 with 5k miles) - Black/Auto/Nav/Sunroof/Rotofab CAI/RDP tuned/1 7/8" LT Speed Engineering Headers w/TSP HF Cats/NPP with 3-way control switch/HD-Link Previous Camaro (sold 11/2015): 2012 2SS - Auto/RS/Black/Sunroof/MyLink Nav/SP 1 7/8" LT Headers w/HF Cats/Hybrid SW Retro Catback w/Borla Pro XS Mufflers/ADM Dyno Tune/C.A.I. CAI/Vmax Spiral Ported Throttle Body/APEX Catch Can/275x4 Squared Wheel Setup/Custom Fit Full Size Spare/Ceramic Tint Replaced with 2013 Black Dodge Charger SRT8

09-05-2017, 07:11 PM	#5
pyroguy Started#gottalovethatblue Drives: ABM #831 Join Date: Apr 2013 Location: TN Posts: 6,943 View My Garage	You might as well go with Texas Speed headers if you're going catted. The cost is almost identical and you might as well buy it all at one place instead of piecing it together to spend basically the same amount of money. __________________ '10 Camaro 2SS/RS \| Aqua Blue #831 of 3,903 \| Silver Stripes Check out my build thread

09-05-2017, 07:41 PM	#7
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	I think my stainless power were about $200 and work good. Your end of your headers matters in what you buy if you have flanged or other non normal headers to match up to the stock exhaust with 2 1/2 " diameter , and of course you would need to fit and cut and strap in the HFCs and replace the O2s into them though they are disabled, most likely your round and not flanged and ready to match up to HFC, just needing to shorten the 2 1/2 "exhaust. It appears they sell a 3 to 2 connection just no cats and they are about the size of HFCs and the shape...... https://www.speed-engineering.com/sh...ton-pipes.html Good Luck, I do not see a merge spike a nice feature listed in their design either.. You also may want to buy a set with a tune for the car which will be needed to disable the back cats and a code of delayed response from the fronts while at the same time being able to change other parameters like fan temp on, a 160 degree thermostat to go with headers usually, and torque management of dealing with other things like 1-4 shift idling low or hill start etc and of course if a good tune some AFR remapping etc.... Places of I can think of....Steve at RDP or Jannetty racing, more places all over like Livernois or Lingenfeltrers, Phastek maybe even or etc etc etc And if you get the tune you will avoid the dreaded CEL until done....check engine light..... and codes thrown which need the tune and can seriously make a auto trans shift better. __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop Last edited by christianchevell; 09-05-2017 at 08:04 PM.

09-06-2017, 11:44 AM	#9
xc_SS/RS Drives: 2010 Camaro SS/RS Join Date: Mar 2014 Location: somewhere in MD Posts: 4,883	Eastern Catalytic 79130 slipped right onto the ends of my speed engineering long tubes and they're 150 for a pair and it was $50 to get reducers welded on to bolt up the 2.5" exhaust. can't beat it! __________________ 2010 2SS/RS Z/28 intake, NW, FAST 102, speed engineering LT's, some exhaust, ATI -10% pulley, GM flex fuel injectors, DSX flex fuel sensor, MGW shifter, HP Tuners, some suspension work, stickers and a little weight loss. 12.63 @113.53

09-05-2017, 06:49 PM	#2
who-dat Drives: 2011 1ss Join Date: Jun 2017 Location: Baton Rouge Posts: 181	I didn't go with cats, but most go with Texas Speed. You have to call them to order their HF cats I believe

09-05-2017, 06:58 PM	#3
Aaron0731 Drives: 2010 2SS/RS L99 Join Date: Oct 2015 Location: Fort Wayne, IN Posts: 295	Bought headers and want cats but didn't buy cats with the headers? Consider me lost

09-06-2017, 09:42 AM	#8
Angie11 Drives: 2011 ss rs convertable Join Date: Feb 2015 Location: WI Posts: 179	I got some from Magna flo that work well and very nice $.....search ebay

09-06-2017, 08:29 PM	#11
camrytt Drives: 2017 ZL1 A10 Join Date: Sep 2014 Location: Raleigh, NC Posts: 592	Contact a local muffler shop and see if they can make some. Henry's muffler in NC made my high flows, installed for about 350 __________________ Current: 2017 ZL1 A10 previous: 2019 1SS A10 previous: '14 L99, CAI intake, vmax ported tb, e85 kit, stage 2 cnc heads, speed engineering long tubes, custom high flows, resonated x pipe, muffler delete, qtp cut outs, gpi ss3 vvt Cam, zl1 pump and injectors, fti triple disc, mayhem motorsports trans cooler and tune, ngk spark plugs +red msd wires, 3.91 gears. Past: '12 LFX, full bolt ons + E85, 302hp/267tq

09-07-2017, 07:13 PM	#13
oslouie Drives: 2018 2SS M6 Redline Join Date: Oct 2014 Location: United States Posts: 431	Probably gonna end up getting these: https://www.amazon.com/MagnaFlow-599...NEY3TSC918W2YX They are 200 cell converters.