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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 02-11-2011, 05:33 PM   #1
erk5000

 
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Doug Thorley Catback installed on 2010 Camaro SS L99

Here is a couple of pics of before I installed the Doug Thorley Catback and after. My stock exhaust had a muffler delete on it as you can see it has no mufflers. The Doug Thorley Catback is not as Loud as the muffler delete was but it has a deeper tone to it. The muffler delete was more raspier an less deep low tone. I do like my new Doug Thorley Catback as it now has mufflers and can pass inspection and as a plus has a performance kick to it.
Before




After






here is a video of stock and muffler delete sound.

sorry for the rain on the DT video, if you guys like I can get a new one.
P.S. I'm really diggin the 4" tips hah
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Old 02-11-2011, 05:35 PM   #2
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Installation took an hour with just me and my buddy. It was quite simple.
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Old 02-11-2011, 09:32 PM   #3
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Old 02-11-2011, 11:51 PM   #4
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Awesome, I am really excited!!! I have mine sitting at home, Gonna get it installed with my cam in a bout a month or 2!!!
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Old 02-12-2011, 12:20 AM   #5
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Do you get the buzzing sound when the AFM kicks in? Seems that XPipe might help it. Also, I've been thinking of doing just a muffler delete on my L99, how was the buzzing when the AFM kicked in, with that setup as well?
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Old 02-12-2011, 05:52 AM   #6
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Quote:
Originally Posted by JoshJ81 View Post
Do you get the buzzing sound when the AFM kicks in? Seems that XPipe might help it. Also, I've been thinking of doing just a muffler delete on my L99, how was the buzzing when the AFM kicked in, with that setup as well?
You can hear the AfM a lot with a muffler delete and to tell you the truth it sounds like shit. At first I didn't notice it but as time went by I kept hearing it and it was quite annoying. On the DT Catback the cars drone Is a whole lot quieter and I love it! You can't go wrong with this system for L99!
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Old 02-12-2011, 01:05 PM   #7
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For the price, DT catback is awsome. I have it and can't complaint.
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Old 02-12-2011, 01:54 PM   #8
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Quote:
Originally Posted by erk5000 View Post
You can hear the AfM a lot with a muffler delete and to tell you the truth it sounds like shit. At first I didn't notice it but as time went by I kept hearing it and it was quite annoying. On the DT Catback the cars drone Is a whole lot quieter and I love it! You can't go wrong with this system for L99!
Okay! I just had my Muffler delete done today and it does sound really good, especially since it was only $80. I figure I'll give this a try for a little while and see if I have problems with the AFM sounds. Like you, I didn't notice the kick down with the AFM on but I've only driven it for about 10 mins and most of it wasn't just cruising :P

Either way, I get to test the delete and still be able to hit up the DT cat back as a back up plan (it's been on my radar as well), as you did. Thanks for the thread as this is what I'm looking for.
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Old 02-12-2011, 01:57 PM   #9
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Also, can you confirm the DT cat back is 3 inch?
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Old 02-12-2011, 03:06 PM   #10
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Quote:
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Also, can you confirm the DT cat back is 3 inch?
Pretty sure it's 2.5
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Old 02-12-2011, 05:26 PM   #11
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It's 2.5"
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Old 02-12-2011, 09:13 PM   #12
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Intalling mine tomorrow. Will put up some pics and let you know how it is with AFM. Next mod will be the VMAX CNC throttle body.

UPDATE: Got mine on, took about an hour. Much better sound. You can hear the AFM more with this setup, but not annoying. Exhaust tips look great. Next CNC Throttle body.
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Old 02-14-2011, 01:09 AM   #13
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Quote:
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Intalling mine tomorrow. Will put up some pics and let you know how it is with AFM. Next mod will be the VMAX CNC throttle body.

UPDATE: Got mine on, took about an hour. Much better sound. You can hear the AFM more with this setup, but not annoying. Exhaust tips look great. Next CNC Throttle body.
Compared to stock, yeah I can hear the AFM but it's not bad at all. Compared to straight pipe, it's a lot more quieter. Straight pipe started to annoy me hah.
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Old 02-14-2011, 01:12 AM   #14
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My wife wasnt too happy with this set up and my friends kinda knocked me for not sounding too loud and almost stock. To me the stock has a higher pitch and the DT Catback has a lower pitch sound. My wife wants it louder than stock so I'm about to order a new set of mufflers and replace these to get a louder sound. Will post video once I get them and installed.
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Old 02-14-2011, 01:14 AM   #15
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here is a clip of them going down the track. Barely noticeable difference.
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Old 02-14-2011, 04:11 AM   #16
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Quote:
Originally Posted by erk5000 View Post
My wife wasnt too happy with this set up and my friends kinda knocked me for not sounding too loud and almost stock. To me the stock has a higher pitch and the DT Catback has a lower pitch sound. My wife wants it louder than stock so I'm about to order a new set of mufflers and replace these to get a louder sound. Will post video once I get them and installed.
Just get some headers!! Believe me, it will be loud enough with more power. DT Long tube will wake this thing up.
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Old 02-14-2011, 04:47 AM   #17
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Quote:
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Just get some headers!! Believe me, it will be loud enough with more power. DT Long tube will wake this thing up.
If I get LT headers I won't pass inspection.
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Old 02-14-2011, 05:42 AM   #18
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If I get LT headers I won't pass inspection.
Why not? Do they do the sniffer test? If not, you can do a couples things that will help you pass.
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Old 02-14-2011, 06:17 AM   #19
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I'm in NC and moving to CA. I'm pretty sure due to strict emissions testing they won't pass you.
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Old 02-14-2011, 06:52 AM   #20
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In the military?
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Old 02-14-2011, 07:05 AM   #21
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Yup
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Old 02-14-2011, 07:10 AM   #22
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Keep your car registered in NC and dont have to worry about California emissions. Perfectly legal!!
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Old 02-14-2011, 07:34 AM   #23
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So, your saying while I'm in CA I won't get inspected?
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Old 02-14-2011, 07:37 AM   #24
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100 percent correct if you keep NC registration. I have been in the military for over 16 yrs and stationed all over. I keep my registration in FL no matter where I go. You only have to meet the inspection requirements for the registration. Not registered in California, no inspection in California.
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Old 02-14-2011, 07:39 AM   #25
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Ohh, and do not change your residency to California.

Good law info here!!

http://www.chp.ca.gov/html/militarydrivers.html
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