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Old 11-29-2010, 07:10 PM   #1
Entaille

 
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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.
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Old 11-29-2010, 08:21 PM   #2
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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.
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Old 11-29-2010, 08:30 PM   #3
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Originally Posted by Milkman20 View Post
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
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Old 11-29-2010, 08:35 PM   #4
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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.
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Old 11-29-2010, 08:36 PM   #5
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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.
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Exhaust Clip: http://youtu.be/c_quv8eoVNQ
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Old 11-29-2010, 09:56 PM   #6
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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
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Old 11-29-2010, 10:05 PM   #7
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Get the tune and live dangerously and go loud (louder the better)
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Old 11-29-2010, 10:15 PM   #8
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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.
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Old 11-29-2010, 10:56 PM   #9
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again I have no interest in tuning as I value the warranty .. for now.
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Old 11-29-2010, 11:05 PM   #10
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Get the tune and live dangerously and go loud (louder the better)
AMEN!!
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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
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Old 11-30-2010, 12:43 AM   #11
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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
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Old 11-30-2010, 12:45 AM   #12
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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.
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Old 11-30-2010, 12:50 AM   #13
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warranty in tack, just reload stock tune when it goes in for service, no problems.
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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
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Old 11-30-2010, 01:32 AM   #14
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Quote:
Originally Posted by |BLACKSS| View Post
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 ?
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