L99 owners - high flow cats, cat back exhaust, and AFM - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Entaille · 11-29-2010, 07:10 PM

I am trying to cover all of my concerns before I buy high flow cats. I bought the MBRP system designed for the L99 / 6 speed auto and it sounds great, but too quiet. I know high flow cats will wake that right up and provide a little power gain, while allowing me to avoid getting a tune (reason for not getting long tubes)

any owners out there in the same boat that went through with it? L99, HFCs and a catback without a tune? I am concerned that when AFM kicks on the exhaust will sound sound will turn crappy and amplified, currently AFM is not a concern at all.

I may just chance it and see how it goes but would like to avoid the resale hit and install times if someone's already experienced this and disliked it.

Milkman20 · 11-29-2010, 08:21 PM

I have a L99 with LTH, x-pipe and loudmouth 1. I had my loudmouth 1 installed(which is basically muffler delete) before i got my tune and AFM was still on, it was noticeable when AFM kicked in but it didn't sound THAT bad. it wasn't crazy annoying but it was noticeable. then i bought a diablosport for $290 and a cord that is used to connect it to my computer or laptop. anyway i turned off afm with that and had a local specialty mechanics shop use my diablosport connected to his laptop and got me a tune. then i bought LTH(no cats) and an x-pipe. I'm getting high flow cats soon and getting another tune with a different program that the mechanics shop is using and not charging me. But if i stopped after loudmouth 1 and got no tune i would be happy. but if u got headers it would be really noticeable and i assume annoying. sorry if i rambled lol.

mikeSS · 11-29-2010, 08:30 PM

Quote:

Originally Posted by Milkman20

I have a L99 with LTH, x-pipe and loudmouth 1. I had my loudmouth 1 installed(which is basically muffler delete) before i got my tune and AFM was still on, it was noticeable when AFM kicked in but it didn't sound THAT bad. it wasn't crazy annoying but it was noticeable. then i bought a diablosport for $290 and a cord that is used to connect it to my computer or laptop. anyway i turned off afm with that and had a local specialty mechanics shop use my diablosport connected to his laptop and got me a tune. then i bought LTH(no cats) and an x-pipe. I'm getting high flow cats soon and getting another tune with a different program that the mechanics shop is using and not charging me. But if i stopped after loudmouth 1 and got no tune i would be happy. but if u got headers it would be really noticeable and i assume annoying. sorry if i rambled lol.

so you are running LTs with not cats with a muffler delete lol... thats got to be hella loud

Entaille · 11-29-2010, 08:35 PM

I envy you guys that got a tune I'm just *****footin it : )

really looking to hear from L99 owners with high flow cats and no tune.

Milkman20 · 11-29-2010, 08:36 PM

Quote:

Originally Posted by mikeSS

so you are running LTs with not cats with a muffler delete lol... thats got to be hella loud

haha yeah, but i love it, resonators are gone too btw. there is a video below in my sig i gotta make another though cause sound broke up, cause it was so loud.

|BLACKSS| · 11-29-2010, 09:56 PM

I have jba highflow cats resonator delete with edelbrock x pipe and muffler delete. I love my exhaust and so does everyone that hears the car. What I do to avoid A F M is put the car in manual mode shift up to third and then down shift to second and then up shift back to third this disables A F M but you have to stay in manual mode if you put it back in drive A F M comes back....everyone say my car sounds mean as hell

2010 SSRS · 11-29-2010, 10:05 PM

Get the tune and live dangerously and go loud (louder the better)

chevyss · 11-29-2010, 10:15 PM

I installed ARH w/high flow cats to the stock t/pipes and mufflers first. It was good, but the AFM would cut in and out which was annoying, so, I installed a CAI and a custom tune. Shut off the AFM and the car is awesome. Ran it on a road trip for 5200 miles and it performed flawlessly. 24.3 MPG at 70-75 most of time. Get-er-done.

Entaille · 11-29-2010, 10:56 PM

again I have no interest in tuning as I value the warranty .. for now.

Milkman20 · 11-29-2010, 11:05 PM

Quote:

Originally Posted by 2010 SSRS

Get the tune and live dangerously and go loud (louder the better)

AMEN!!

Buffnshine · 11-30-2010, 12:43 AM

Being a California car i have not messed with the long tubes or High flow cats. I have done a Flowmaster Cat back but my best investment has been my SCT x3 handheld tuner with a tune from Janetty turning off my AFM and tuning the transmission shift points

Entaille · 11-30-2010, 12:45 AM

I'm sure the tunes the best thing for an L99 if you want to have some fun with it. I just really value the warranty until I have put some serious miles on the car and have it thoroughly looked over. 2k miles and no track time yet, not the time to break the warranty for me.

Buffnshine · 11-30-2010, 12:50 AM

warranty in tack, just reload stock tune when it goes in for service, no problems.

mikeSS · 11-30-2010, 01:32 AM

Quote:

Originally Posted by |BLACKSS|

I have jba highflow cats resonator delete with edelbrock x pipe and muffler delete. I love my exhaust and so does everyone that hears the car. What I do to avoid A F M is put the car in manual mode shift up to third and then down shift to second and then up shift back to third this disables A F M but you have to stay in manual mode if you put it back in drive A F M comes back....everyone say my car sounds mean as hell

thats kind of a process lol, if i saw you doing that i would be like WTF ?

11-29-2010, 07:10 PM	#1
Entaille Drives: 2018 Camaro 2SS Join Date: Aug 2010 Location: Lake Stevens Posts: 1,005	L99 owners - high flow cats, cat back exhaust, and AFM I am trying to cover all of my concerns before I buy high flow cats. I bought the MBRP system designed for the L99 / 6 speed auto and it sounds great, but too quiet. I know high flow cats will wake that right up and provide a little power gain, while allowing me to avoid getting a tune (reason for not getting long tubes) any owners out there in the same boat that went through with it? L99, HFCs and a catback without a tune? I am concerned that when AFM kicks on the exhaust will sound sound will turn crappy and amplified, currently AFM is not a concern at all. I may just chance it and see how it goes but would like to avoid the resale hit and install times if someone's already experienced this and disliked it. __________________

11-29-2010, 08:21 PM	#2
Milkman20 Drives: Red 2010 Camaro 2SS L99 Join Date: Apr 2010 Location: Naperville, IL Posts: 208 View My Garage	I have a L99 with LTH, x-pipe and loudmouth 1. I had my loudmouth 1 installed(which is basically muffler delete) before i got my tune and AFM was still on, it was noticeable when AFM kicked in but it didn't sound THAT bad. it wasn't crazy annoying but it was noticeable. then i bought a diablosport for $290 and a cord that is used to connect it to my computer or laptop. anyway i turned off afm with that and had a local specialty mechanics shop use my diablosport connected to his laptop and got me a tune. then i bought LTH(no cats) and an x-pipe. I'm getting high flow cats soon and getting another tune with a different program that the mechanics shop is using and not charging me. But if i stopped after loudmouth 1 and got no tune i would be happy. but if u got headers it would be really noticeable and i assume annoying. sorry if i rambled lol. __________________ 2010 Camaro 2SS/RS L99 6AT - 451 RWHP, 414 RWTQ TSP VVT-3 Cam DOD/AFM Delete, Ported Stock Heads, Circle-D 2B Multi Disk Converter, Custom 3" Exhaust w/Burns Mufflers Exhaust Clip: http://youtu.be/c_quv8eoVNQ

11-29-2010, 08:35 PM	#4
Entaille Drives: 2018 Camaro 2SS Join Date: Aug 2010 Location: Lake Stevens Posts: 1,005	I envy you guys that got a tune I'm just *****footin it : ) really looking to hear from L99 owners with high flow cats and no tune. __________________

11-29-2010, 09:56 PM	#6
\|BLACKSS\| Drives: BLACK 1SS Join Date: Apr 2010 Location: SOUTHERN ILLINOIS Posts: 269	I have jba highflow cats resonator delete with edelbrock x pipe and muffler delete. I love my exhaust and so does everyone that hears the car. What I do to avoid A F M is put the car in manual mode shift up to third and then down shift to second and then up shift back to third this disables A F M but you have to stay in manual mode if you put it back in drive A F M comes back....everyone say my car sounds mean as hell __________________ COLD AIR INDUCTIONS CAI JBA HIGH FLOW CATS EDELBROCK X-PIPE MUFFLER DELETE Last edited by \|BLACKSS\|; 11-29-2010 at 09:57 PM. Reason: spelling

11-29-2010, 10:05 PM	#7
2010 SSRS Drives: 3 V8 Camaros Join Date: May 2009 Location: The Ocean State Posts: 111,186 View My Garage	Get the tune and live dangerously and go loud (louder the better) __________________ Jannetty Racing JRE Street Package

11-29-2010, 10:15 PM	#8
chevyss SS/RS Drives: 2010 SS/RS IOM w/blk stripes A6 Join Date: Jun 2009 Location: Eastern Washington Posts: 816 View My Garage	I installed ARH w/high flow cats to the stock t/pipes and mufflers first. It was good, but the AFM would cut in and out which was annoying, so, I installed a CAI and a custom tune. Shut off the AFM and the car is awesome. Ran it on a road trip for 5200 miles and it performed flawlessly. 24.3 MPG at 70-75 most of time. Get-er-done.

11-29-2010, 10:56 PM	#9
Entaille Drives: 2018 Camaro 2SS Join Date: Aug 2010 Location: Lake Stevens Posts: 1,005	again I have no interest in tuning as I value the warranty .. for now. __________________

11-30-2010, 12:43 AM	#11
Buffnshine So Cal Camaro5 Race Team Drives: '10 SS/RS, '06 HHR, '70 El Camino Join Date: Sep 2009 Location: Huntington Beach, CA Posts: 2,589 View My Garage	Being a California car i have not messed with the long tubes or High flow cats. I have done a Flowmaster Cat back but my best investment has been my SCT x3 handheld tuner with a tune from Janetty turning off my AFM and tuning the transmission shift points __________________ TEAM L99 - So Cal Camaro5 Race Team #27 9/5/09 Purchased #36962 Black 1SS/RS L99 "E-TCKT" Base Dyno 328hp/341tq @BBK meet Mods to Date: Window Tint 5% & 15%, ACC P13W Lighting, Adaptive DRL Harness, Ghost Armor, Lloyds "SS" Mats, Dash Plaque, Flowmaster Outlaw Exhaust, Drake Front Bowtie Delete, Stealth 3457 Chrome/Mirror Signal Bulbs, Grant Revolutions Steering Wheel, PFADT Sport Springs, Sway Bars, End Links, Trailing Arms, 4 Wheel Alignment, Hurst Auto Shifter and Paddle Shifter, Satin Black Rear Tail Light Bezels

11-30-2010, 12:45 AM	#12
Entaille Drives: 2018 Camaro 2SS Join Date: Aug 2010 Location: Lake Stevens Posts: 1,005	I'm sure the tunes the best thing for an L99 if you want to have some fun with it. I just really value the warranty until I have put some serious miles on the car and have it thoroughly looked over. 2k miles and no track time yet, not the time to break the warranty for me. __________________

11-30-2010, 12:50 AM	#13
Buffnshine So Cal Camaro5 Race Team Drives: '10 SS/RS, '06 HHR, '70 El Camino Join Date: Sep 2009 Location: Huntington Beach, CA Posts: 2,589 View My Garage	warranty in tack, just reload stock tune when it goes in for service, no problems. __________________ TEAM L99 - So Cal Camaro5 Race Team #27 9/5/09 Purchased #36962 Black 1SS/RS L99 "E-TCKT" Base Dyno 328hp/341tq @BBK meet Mods to Date: Window Tint 5% & 15%, ACC P13W Lighting, Adaptive DRL Harness, Ghost Armor, Lloyds "SS" Mats, Dash Plaque, Flowmaster Outlaw Exhaust, Drake Front Bowtie Delete, Stealth 3457 Chrome/Mirror Signal Bulbs, Grant Revolutions Steering Wheel, PFADT Sport Springs, Sway Bars, End Links, Trailing Arms, 4 Wheel Alignment, Hurst Auto Shifter and Paddle Shifter, Satin Black Rear Tail Light Bezels

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Exhaust options for L99 with AFM tuned out	3BVert	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	11	07-19-2011 12:22 AM
Exhaust for an L99 car	kbui	USA - Texas	19	04-16-2010 12:52 PM
SLP exhaust + L99... AFM? 4 cylinder issue?	Jakefeb3	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	3	10-21-2009 11:02 PM
Just got off the phone with Borla! L99 + AFM look here	HeavyD	Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons	1	09-17-2009 03:05 PM
L99 engine specifications	Tran	Wiki	0	10-19-2008 12:40 PM