Doug Thorley shorties install questions - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ssmike · 10-21-2009, 07:50 PM

Anyone who has installed Doug Thorley shorties I have some questions.
1) Do they install from above or below. If below, how high do you have to jack the front end up?
2) Do you have to remove the cats like the instructions say to do?
3) How long does it take?
4) Any issues with alignment to the cat flanges?

Thanks!

BITCHIN CAMARO · 10-21-2009, 08:05 PM

Driver above, Passenger side below.
No need to remove the cats or the wires that go to the sensors. Just loosen the bolts that hold them on.
Use a floor jack and jack up high enough to get the header in.
Took 1.5 hrs
Don't remeber any alignment issues to the cat flanges

fldrummer · 10-21-2009, 09:47 PM

I encountered alignment issues with the cat flange on the driver-side. 'Had to take it to my exhaust shop and have the guy heat it up with the welding torch to line them up (at least he didn't charge me). Mine must have just had a glitch with the alignment, as I haven't heard of anyone else with that issue. I don't know how it took these guys 1.5-3 hours to do the swap. It took me and bobby35ny 9 hours to do mine and we weren't goofing around. I guess it was because it was hard to get around without a good lift and just a jack and we had trouble getting the stock passenger-side manifold out. Don't let it deter you though. I'm pretty happy with the performance now that everything's aligned correctly.

Missile Man · 10-21-2009, 10:31 PM

Took me about 5 hours. Had to remove the cats in order to remove from the bottom. The instructions say to remove the manifold and cats as 1 piece. I found it easier to unbolt at the flange that connects the cats to the manifold. There's a couple of manifold bolts that require slow going with a wrench. The only thing I didn't like was that they don't come with new gaskets. Overall not that bad, and love the headers.

HeavyD · 10-22-2009, 01:00 AM

Quote:

Originally Posted by Missile Man

The only thing I didn't like was that they don't come with new gaskets.

Yah, WTF?

ssmike · 10-22-2009, 05:14 PM

Quote:

Originally Posted by Missile Man

Took me about 5 hours. Had to remove the cats in order to remove from the bottom. The instructions say to remove the manifold and cats as 1 piece. I found it easier to unbolt at the flange that connects the cats to the manifold. There's a couple of manifold bolts that require slow going with a wrench. The only thing I didn't like was that they don't come with new gaskets. Overall not that bad, and love the headers.

Did you re-use the old gaskets or get new ones?

The Leaf · 10-22-2009, 06:23 PM

they said to re-use the stock gaskets, but i bought a new set from gm and used them they were about $13 each, this will have been the 4th car ive put a set of headers on and i cant see reusing gaskets even if they are metal.

ssmike · 10-24-2009, 08:33 AM

I did the install last night, took about 5 hours total! Driver's side I did alone in about 1 1/2 hours and installed from the topside. The passenger side I had help with and took about 3 1/2 hours. All went well and I thank all of you for your advise and suggestions. Now today I'll take her out for a spirited romp to see how they sound and perform! All in all the install went fairly smooth, just tough to get some of the manifold bolts out and had a little trouble lining everything up. Definatly a 2 man project.

*radz28* · 10-24-2009, 09:43 AM

Cool! Please report back with a butt-o-meter assessment and if there was much improvement in sound

HeavyD · 10-24-2009, 09:58 AM

Anyone removing the spark plugs?

Icntdrv55 · 10-24-2009, 11:11 AM

So can you tell the differance in the ol butt dyno? I am thinking of putting a set on as well but want to know if they are worth it or not! I wouldnt expect to see or feel a huge differance but you should feel something !

The Leaf · 10-24-2009, 11:35 AM

I removed the spark plugs only the passenger side cuz i thought it was easier to work the header into posittion...

Cooper2010 · 10-24-2009, 03:36 PM

1. When removing the oil dipstick tube do you also need to drain the oil?

2. Did anyone have any trouble with wirings coming close to the headers (Need to use zip ties to put them in better position)?

3. Does the stock header shielding fit over these? If so would it make any difference?

Thanks for the help!

ssmike · 10-24-2009, 05:22 PM

Quote:

Originally Posted by Cooper2010

1. When removing the oil dipstick tube do you also need to drain the oil?

2. Did anyone have any trouble with wirings coming close to the headers (Need to use zip ties to put them in better position)?

3. Does the stock header shielding fit over these? If so would it make any difference?

Thanks for the help!

No for all 3

10-21-2009, 07:50 PM	#1
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,840	Doug Thorley shorties install questions Anyone who has installed Doug Thorley shorties I have some questions. 1) Do they install from above or below. If below, how high do you have to jack the front end up? 2) Do you have to remove the cats like the instructions say to do? 3) How long does it take? 4) Any issues with alignment to the cat flanges? Thanks!

10-21-2009, 10:31 PM	#4
Missile Man Drives: 2010 2SS/Black Join Date: Mar 2009 Location: Tucson, AZ Posts: 608	Took me about 5 hours. Had to remove the cats in order to remove from the bottom. The instructions say to remove the manifold and cats as 1 piece. I found it easier to unbolt at the flange that connects the cats to the manifold. There's a couple of manifold bolts that require slow going with a wrench. The only thing I didn't like was that they don't come with new gaskets. Overall not that bad, and love the headers. __________________ 2010 Black 2SS L99 Mods: * CAI Intake * Magnuson MP2300 TVS Supercharger/RDS Spacer * Vector Motorsports Tune * Stainless Power LT/Hi Flow Cats/Tru X-* Pipe/36" J-Pipes/40 Series * R1 Concepts ceramic pads and slotted/drilled rotors

10-24-2009, 09:43 AM	#9
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,198 View My Garage	Cool! Please report back with a butt-o-meter assessment and if there was much improvement in sound __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

10-24-2009, 11:11 AM	#11
Icntdrv55 CCOTR Member Drives: Victory Red 2010 2SS/RS A6 Join Date: Jun 2009 Location: Parker CO Posts: 1,096	So can you tell the differance in the ol butt dyno? I am thinking of putting a set on as well but want to know if they are worth it or not! I wouldnt expect to see or feel a huge differance but you should feel something ! __________________ Camaro Club Of The Rockies (CCOTR) Check us out on Facebook! --------------------------- 2010 Camaro SS/RS Victory Red A6- Vararam Intake, Doug Thorley Tri Y LTs, Magnaflow X-pipe, Flowmaster Super 40's, VMS Tune, Razzi Ground Effects, Herritage Grill, RED headlight and fog light Halos, LED DRLs, Dash and extended Door ABL, engine, grill and rear defusser LED lighting ........ 12.59@112.21 (DA Corrected)

10-24-2009, 03:36 PM	#13
Cooper2010 Drives: 2010 LS3 2SS CGM Join Date: Apr 2009 Location: Del Rio, TX Posts: 74	1. When removing the oil dipstick tube do you also need to drain the oil? 2. Did anyone have any trouble with wirings coming close to the headers (Need to use zip ties to put them in better position)? 3. Does the stock header shielding fit over these? If so would it make any difference? Thanks for the help! __________________ CGM 2SS LS3

10-21-2009, 08:05 PM	#2
BITCHIN CAMARO Drives: 2010 Camaro RS SS Join Date: Dec 2008 Location: Bay Area, Ca Posts: 194	Driver above, Passenger side below. No need to remove the cats or the wires that go to the sensors. Just loosen the bolts that hold them on. Use a floor jack and jack up high enough to get the header in. Took 1.5 hrs Don't remeber any alignment issues to the cat flanges

10-21-2009, 09:47 PM	#3
fldrummer "Black Ace" Drives: Supercharged 2010 SS, 2016 Golf R Join Date: Aug 2008 Location: Ft. Lauderdale, FL Posts: 1,352	I encountered alignment issues with the cat flange on the driver-side. 'Had to take it to my exhaust shop and have the guy heat it up with the welding torch to line them up (at least he didn't charge me). Mine must have just had a glitch with the alignment, as I haven't heard of anyone else with that issue. I don't know how it took these guys 1.5-3 hours to do the swap. It took me and bobby35ny 9 hours to do mine and we weren't goofing around. I guess it was because it was hard to get around without a good lift and just a jack and we had trouble getting the stock passenger-side manifold out. Don't let it deter you though. I'm pretty happy with the performance now that everything's aligned correctly.

10-22-2009, 06:23 PM	#7
The Leaf Drives: 2010 Camaro SS Join Date: Mar 2009 Location: Staten Island, NY Posts: 32	they said to re-use the stock gaskets, but i bought a new set from gm and used them they were about $13 each, this will have been the 4th car ive put a set of headers on and i cant see reusing gaskets even if they are metal.

10-24-2009, 08:33 AM	#8
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,840	I did the install last night, took about 5 hours total! Driver's side I did alone in about 1 1/2 hours and installed from the topside. The passenger side I had help with and took about 3 1/2 hours. All went well and I thank all of you for your advise and suggestions. Now today I'll take her out for a spirited romp to see how they sound and perform! All in all the install went fairly smooth, just tough to get some of the manifold bolts out and had a little trouble lining everything up. Definatly a 2 man project.

10-24-2009, 09:58 AM	#10
HeavyD Drives: 1SSRS RY L99 Join Date: Aug 2009 Location: Ontario Posts: 1,329	Anyone removing the spark plugs?

10-24-2009, 11:35 AM	#12
The Leaf Drives: 2010 Camaro SS Join Date: Mar 2009 Location: Staten Island, NY Posts: 32	I removed the spark plugs only the passenger side cuz i thought it was easier to work the header into posittion...

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