Exhaust on lowered Blazer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72BLAZERDUDE · 08-13-2003, 07:14 PM

Im doing a 4/6 drop on my Blazer and also need to replace the exhaust sys. I have the shorty headers. I want to run the pipes up between the frame rails but I have talked to 3 muffler shops and all 3 gave me grief about doing it. One guy even told me I should reconsider how much I am dropping it, that it is to low for the road if you have to put the exhaust up in the frame. None of them wanted to cut the holes for the exhaust to run through the middle crossmember. Am I asking to much. Do I really need to put it up that high if I am not dropping it with air bags. Does this cause problems with welding it up what about the crossover. Just not sure what way to go.

Alexis · 08-13-2003, 07:20 PM

i ran my exhaust under the crossmember, the muffler sat right under the rear top shock mount crossmember with turn downs. I really didn't hit anything oddly enough. You are not asking much..... I'd look for a better shop if these guys are crying about a little fab. work.

chiphayes · 08-13-2003, 07:39 PM

i ran into the same thing,i ordered 2 mandrel bent 90s from summit racing,cut the 3 hole flange off of the shorty headers,shortened the 90s with a sawzall.welded the 90s on were the flange used to be,that also eliminates the collector gaskets,then the muffler shops did there thing.if you have angle plug heads,good luck on getting you plug wires on and off.

Glen · 08-13-2003, 09:54 PM

I just ran my exhaust, I kicked it out behind the tire and ran it down the side of the frame rail, the mufflers are right at the front of the cab and then it goes over the axle and out behind the tire

tommie · 08-13-2003, 10:15 PM

glen, got any more pics of your truck?

haven't seen it.

looks nice

Glen · 08-13-2003, 10:18 PM

not really, just kind of getting started. You can see some progress here: www.hotrodsbyglen.com

PrimeredThunder · 08-13-2003, 10:44 PM

I've got airbags on my 72' with no drop spindles and C-Notch running full length headers and 2.5" exhaust under the frame its less than an inch from the ground aired out....

72c10step · 08-14-2003, 08:27 AM

PrimeredThunder,

What brand of full length headers are you running? I wnat to put full length headers on my truck, and future plans include a 2.5/4 drop or (preferably) airbags, but I don't want to scrape exhaust. How did you do it?

PrimeredThunder · 08-14-2003, 05:08 PM

I have a set of Heddman Hedders on my truck. They hang a noticeable distance below the frame as does teh exhaust, but with the airbags and the adjustability they have, its not a big deal, as I dont plan on driving teh truck aired out

I used to have about a 3/4 drop on my truck before the 'bags and I never had any trouble with scraping. I can get pics of my setup once my digicam charges.

Kenny

grnddwn · 08-14-2003, 05:36 PM

Find another exhaust shop or tell those guys to get they're head outta their ass. I'm running a pair of shorty headers from a an 80s camaro into a single three inch flowmaster the pipes yY together just past the tranny then pass through the trailing arm crossmember that has been reinforced with a piece of 4 inch pipe my tailpipe then goes under my rearend and out the back lefthand corner of my truck. If your not bagging it you can go over the rearend laidout my exhaust does not touch the ground. Keep it up as high as you can because clipping your exhaust on something on the road can do wonders for your whole truck, and make sure it exits the underside of your truck or you will regret it. Very loud with the top on.

72 2wd Blazer · 08-14-2003, 08:02 PM

Quote:

Originally posted by 72BLAZERDUDE
Im doing a 4/6 drop on my Blazer and also need to replace the exhaust sys. I have the shorty headers. I want to run the pipes up between the frame rails but I have talked to 3 muffler shops and all 3 gave me grief about doing it.

None of them wanted to cut the holes for the exhaust to run through the middle crossmember. Am I asking to much. Do I really need to put it up that high if I am not dropping it with air bags. Does this cause problems with welding it up what about the crossover. Just not sure what way to go.

Mine was done that way and it works great. It wasn't done the prettiest way, but it is under the truck and you don't see it anyway.

72c10step · 08-14-2003, 08:25 PM

PrimeredThunder,

Does the collector on the headers run parallel to the frame, or is it at a downward angle? My friend has a pair of Flowtechs, and glasspacks that bolt directly to the collector flange, but they angle down so close to the grounnd, he has to switch them out and have a system bent up. I didn't want to run into the same problem.

PrimeredThunder · 08-14-2003, 10:29 PM

One of the collectors does angle downward, but when I had my system bent they fixed that. The best way to go is to have a custom system bent to your wants and needs, that is if you can find someone to do it

Kenny

72BLAZERDUDE · 08-14-2003, 11:08 PM

I finally found someone who will do it. The problem is that I have to cut the holes in the crossmember. Since I dont have access to a welder I was thinking I could make four plates out of 1/4 inch steel about 4 x 5 with 3 1/2 holes cut in the center. Cut 3 1/2 holes in the cross member and sandwich thewhole thing together with bolts. I realize that a plate on each side of the crossmember is overkill but I worry about the integrity of that because of the trailing arm mounting points. What do you think of this idea. I think I can cut the holes with a hole saw. Maybe I will get the plates made with all the holes put in. Then all I have to do is cut the holes in the crossmember.

08-13-2003, 07:14 PM	#1
72BLAZERDUDE Registered User Join Date: Jan 2002 Location: WATAUGA,TX Posts: 675	Exhaust on lowered Blazer Im doing a 4/6 drop on my Blazer and also need to replace the exhaust sys. I have the shorty headers. I want to run the pipes up between the frame rails but I have talked to 3 muffler shops and all 3 gave me grief about doing it. One guy even told me I should reconsider how much I am dropping it, that it is to low for the road if you have to put the exhaust up in the frame. None of them wanted to cut the holes for the exhaust to run through the middle crossmember. Am I asking to much. Do I really need to put it up that high if I am not dropping it with air bags. Does this cause problems with welding it up what about the crossover. Just not sure what way to go. __________________ 72 2wd 307/AT/AC/TILT WHEEL 78 JIMMY HIGH SIERRA

08-13-2003, 09:54 PM	#4
Glen Registered User Join Date: Jan 2003 Location: Chandler, AZ Posts: 189	I just ran my exhaust, I kicked it out behind the tire and ran it down the side of the frame rail, the mufflers are right at the front of the cab and then it goes over the axle and out behind the tire Attached Images

08-13-2003, 10:44 PM	#7
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	I've got airbags on my 72' with no drop spindles and C-Notch running full length headers and 2.5" exhaust under the frame its less than an inch from the ground aired out.... __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

08-14-2003, 08:27 AM	#8
72c10step WHYBYNU when old will do? Join Date: Jul 2003 Location: Loudon, NH Posts: 876	PrimeredThunder, What brand of full length headers are you running? I wnat to put full length headers on my truck, and future plans include a 2.5/4 drop or (preferably) airbags, but I don't want to scrape exhaust. How did you do it? __________________ -72 Chevy C10 Stepside -2002 Chevy Silverado 2500HD 4x4 -1984 Jeep CJ7 -1995 Polaris XCR600 Custom -2003 Honda 300ex

08-14-2003, 05:08 PM	#9
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	I have a set of Heddman Hedders on my truck. They hang a noticeable distance below the frame as does teh exhaust, but with the airbags and the adjustability they have, its not a big deal, as I dont plan on driving teh truck aired out I used to have about a 3/4 drop on my truck before the 'bags and I never had any trouble with scraping. I can get pics of my setup once my digicam charges. Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

08-13-2003, 07:20 PM	#2
Alexis Member since 2000 Join Date: Dec 2000 Location: Mountain View Ca / Mexico Posts: 7,879	i ran my exhaust under the crossmember, the muffler sat right under the rear top shock mount crossmember with turn downs. I really didn't hit anything oddly enough. You are not asking much..... I'd look for a better shop if these guys are crying about a little fab. work.

08-13-2003, 07:39 PM	#3
chiphayes Registered User Join Date: Jan 2003 Location: indiana Posts: 186	i ran into the same thing,i ordered 2 mandrel bent 90s from summit racing,cut the 3 hole flange off of the shorty headers,shortened the 90s with a sawzall.welded the 90s on were the flange used to be,that also eliminates the collector gaskets,then the muffler shops did there thing.if you have angle plug heads,good luck on getting you plug wires on and off.

08-13-2003, 10:15 PM	#5
tommie 97' Tahoe 2dr/2wd Join Date: Jul 2002 Location: Huffman,TX Posts: 1,168	glen, got any more pics of your truck? haven't seen it. looks nice

08-13-2003, 10:18 PM	#6
Glen Registered User Join Date: Jan 2003 Location: Chandler, AZ Posts: 189	not really, just kind of getting started. You can see some progress here: www.hotrodsbyglen.com

08-14-2003, 05:36 PM	#10
grnddwn belly dragger Join Date: Feb 2002 Location: sherwood park AB. Canada Posts: 696	Find another exhaust shop or tell those guys to get they're head outta their ass. I'm running a pair of shorty headers from a an 80s camaro into a single three inch flowmaster the pipes yY together just past the tranny then pass through the trailing arm crossmember that has been reinforced with a piece of 4 inch pipe my tailpipe then goes under my rearend and out the back lefthand corner of my truck. If your not bagging it you can go over the rearend laidout my exhaust does not touch the ground. Keep it up as high as you can because clipping your exhaust on something on the road can do wonders for your whole truck, and make sure it exits the underside of your truck or you will regret it. Very loud with the top on.

08-14-2003, 08:25 PM	#12
72c10step WHYBYNU when old will do? Join Date: Jul 2003 Location: Loudon, NH Posts: 876	PrimeredThunder, Does the collector on the headers run parallel to the frame, or is it at a downward angle? My friend has a pair of Flowtechs, and glasspacks that bolt directly to the collector flange, but they angle down so close to the grounnd, he has to switch them out and have a system bent up. I didn't want to run into the same problem. __________________ -72 Chevy C10 Stepside -2002 Chevy Silverado 2500HD 4x4 -1984 Jeep CJ7 -1995 Polaris XCR600 Custom -2003 Honda 300ex

08-14-2003, 10:29 PM	#13
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	One of the collectors does angle downward, but when I had my system bent they fixed that. The best way to go is to have a custom system bent to your wants and needs, that is if you can find someone to do it Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

08-14-2003, 11:08 PM	#14
72BLAZERDUDE Registered User Join Date: Jan 2002 Location: WATAUGA,TX Posts: 675	I finally found someone who will do it. The problem is that I have to cut the holes in the crossmember. Since I dont have access to a welder I was thinking I could make four plates out of 1/4 inch steel about 4 x 5 with 3 1/2 holes cut in the center. Cut 3 1/2 holes in the cross member and sandwich thewhole thing together with bolts. I realize that a plate on each side of the crossmember is overkill but I worry about the integrity of that because of the trailing arm mounting points. What do you think of this idea. I think I can cut the holes with a hole saw. Maybe I will get the plates made with all the holes put in. Then all I have to do is cut the holes in the crossmember. __________________ 72 2wd 307/AT/AC/TILT WHEEL 78 JIMMY HIGH SIERRA



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