V6 and Sophn Subframe Connectors
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Joined: Feb 2002
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From: Lehigh Valley, PA
Car: 00 T/A Firehawk
Engine: 346ci LS1
Transmission: MN6
Axle/Gears: 3.42 LSD
V6 and Sophn Subframe Connectors
I was just wondering if any of you guys are runnin the Sophn subframe connectors or any subframe connectors at all? I'm aware that I could put this in the suspension topic, but I was curious as to if any of you V6 guys are running them. I'm thinking about buying a set this summer. I've heard great things about them.
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Joined: Feb 2003
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From: Mostly in water off So. Cal
Car: '87 Chev
Engine: 60*V6
Transmission: DY T700
I put his new tubular SFC's on mine, Did the install myself- everything lined up beautifully. The only alteration I did was to the passenger side outer to inner connection tube he supplies with the kit. It is suppose to lay ontop of the SFC and cross over the top of the cat then weld to the inner subframe of the car near the trans crossmember area. I bent this tube on a tube bender and welded it directly into the right SFC, arching over the cat, tacking it to the floorboard (I removed the cat heat sheild) and then arched back down to the inner subframe. I felt this was much stronger to tie it straight in rather than laying on top- mostly it gave me alot more room/clearence to move my cat exhaust section upward for more ground clearence. also was able to tack an exhaust mount onto that tube connecting to the cat for support- and was able to remove the stock strap mount to the tailshaft of the trans.
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Joined: Feb 2002
Posts: 830
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From: Lehigh Valley, PA
Car: 00 T/A Firehawk
Engine: 346ci LS1
Transmission: MN6
Axle/Gears: 3.42 LSD
Looks good! What kind of cat do you have on redraif? Is it an aftermarket one or the stock one without the heat shields?
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Joined: Mar 2000
Posts: 13,414
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Hey, if someone's looking under the car at the i-pipe, then they're too damn close to the car! 
I'm thinking of putting the Alston SFC's, from Top Down Solutions (top center advertisement on thirdgen.org) onto my '86. I like how there's only two attachment points, front and rear. Plus, they come powder-coated black already... Spohn charges extra for that. I'll weld 'em in myself; and will probably bolt them in first. A guy on the suspension board gave me a good idea; he said I could probably use the bolt holes in the SFC's as another weld point.

I'm thinking of putting the Alston SFC's, from Top Down Solutions (top center advertisement on thirdgen.org) onto my '86. I like how there's only two attachment points, front and rear. Plus, they come powder-coated black already... Spohn charges extra for that. I'll weld 'em in myself; and will probably bolt them in first. A guy on the suspension board gave me a good idea; he said I could probably use the bolt holes in the SFC's as another weld point.
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From: Woodstock, GA
Car: 1987 Trans Am
Originally posted by DJP87Z28
LT1GUY
Didn't mean to rip the exhaust, but a Stainless Steel Catback would look good. Also a Aluminum Dr Shaft might be nice also.
LT1GUY
Didn't mean to rip the exhaust, but a Stainless Steel Catback would look good. Also a Aluminum Dr Shaft might be nice also.
. We just picked up an LS1 aluminum driveshaft last weekend from Hawks, and its in the car now...looks pretty sweet, esp since Shannon polished it!
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From: Woodstock, GA
Car: 1987 Trans Am
Originally posted by WWasem
Looks good! What kind of cat do you have on redraif? Is it an aftermarket one or the stock one without the heat shields?
Looks good! What kind of cat do you have on redraif? Is it an aftermarket one or the stock one without the heat shields?
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Joined: Feb 2002
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From: Moved... GA still, more garage space!
Car: 87 Red/Blk Bird loaded 3.4L & 700R4
Transmission: Th700R4
Axle/Gears: 3.73
Well the exhaust tubing may not lok to pretty, but it was replaced from the cat back after I had had the car a year, backin 90. The car was only 3 years old and the stock exhaust tubes, muffler, and cat were totally rusted out. I was 16 at the time, so Dad handled the fix. He took it to the exhaust guys...they installed the 2.5in Catco cat and ran 2-1/4 inch piping from there to the rear with a stock style muffler.
I replaced the muffler with a Flowmaster about a year and a half ago, then a year ago the cat was replaced with a carsound 2.5 in and out high flow cat. The exhaust piping between the cat and muffler is still from 90, & is still holding up...I would say that is good piping. Infact, until it rusts out or I get the bigger engine the exhaust size is perfect and the tubing solid. K it looks icky, but its 13 years old, and is still rock solid. Plus, who sees it normally!
Before I got the cam it was gurging almost popping when I let off the gas after accelerating (not enough backpressure). With the new cam it is perfect. So the pipe size and set up is on the money...so I'm not changing it until...the 3.8 turbo, thats a different story, nothing but the best then!
The aluminum Drive shaft looks awesome btw! Have to get some good shots below when we get the y-pipe done for the headers.
But yep, the tubing looks yucky!
I replaced the muffler with a Flowmaster about a year and a half ago, then a year ago the cat was replaced with a carsound 2.5 in and out high flow cat. The exhaust piping between the cat and muffler is still from 90, & is still holding up...I would say that is good piping. Infact, until it rusts out or I get the bigger engine the exhaust size is perfect and the tubing solid. K it looks icky, but its 13 years old, and is still rock solid. Plus, who sees it normally!
Before I got the cam it was gurging almost popping when I let off the gas after accelerating (not enough backpressure). With the new cam it is perfect. So the pipe size and set up is on the money...so I'm not changing it until...the 3.8 turbo, thats a different story, nothing but the best then!
The aluminum Drive shaft looks awesome btw! Have to get some good shots below when we get the y-pipe done for the headers.
But yep, the tubing looks yucky!
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