View Poll Results: Which subframe connectors for my daily driver?
Voters: 68. You may not vote on this poll
SFC's Alstons or UMI?
Re: SFC's Alstons or UMI?
Seems im not the first with shipping issues, atleast he made it right for that guy, problem very similar to mine.
https://www.thirdgen.org/forums/afte...?highlight=umi
https://www.thirdgen.org/forums/afte...?highlight=umi
Again, I apologize for the shipping delay.
No matter a company does they are going to have mistakes here and there. That issue was almost a year ago, a few issues a year is common with any larger company. We ship 150-200 packages a week, for a few a year to get mixed up is still over a 99% accuracy.
Again I apologize, But I am glad you like them.
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: SFC's Alstons or UMI?
Looks good. The black color really hides them nice. I was thinking of spraying mine with flat black eventually, just because they are so visible.
Any luck on installing them yet?
Any luck on installing them yet?
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: SFC's Alstons or UMI?
I posted this picture earlier in the thread, but I will put it again for you here.
Anyhow, the trick is to get the main SFC in place, then stick the little piece over the exhaust and on top of the main sfc. Then, slide it forward or backward, untill it is tight with both the subframe and the connector. Probably more forward like mine. Then, mark exactly where it needs to be welded to the SFC.
You really should weld it off the car. I didnt, because we didnt have the resources to replace exhaust flanges just to drop the pipe. But if your exhaust is newer, you should be able to get the whole y-pipe out, and the catalytic pipe too. That will give you room to lift it in place all as one part. Just like the driver side.
Also, when you put the exhaust back on, you might be able to put a little more slack in the hangars to lower it some more. But it probably should fit fine unless you are running dual cats or some massive pipe.
Anyhow, the trick is to get the main SFC in place, then stick the little piece over the exhaust and on top of the main sfc. Then, slide it forward or backward, untill it is tight with both the subframe and the connector. Probably more forward like mine. Then, mark exactly where it needs to be welded to the SFC.
You really should weld it off the car. I didnt, because we didnt have the resources to replace exhaust flanges just to drop the pipe. But if your exhaust is newer, you should be able to get the whole y-pipe out, and the catalytic pipe too. That will give you room to lift it in place all as one part. Just like the driver side.
Also, when you put the exhaust back on, you might be able to put a little more slack in the hangars to lower it some more. But it probably should fit fine unless you are running dual cats or some massive pipe.
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: SFC's Alstons or UMI?
If the y-pipe is all one piece with the test pipe and intermediate pipe, I would just un-bolt it from the header flanges. Then, slide the hangers off and it should drop down. No need to un-do it from the muffler, because there is plenty of play back there. Even if it only rotates down a little ways, that should be enough room to lift the SFC in there as one piece.
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: SFC's Alstons or UMI?
No, but I was thinking about it. I figured it wouldnt be strong enough to hold up the shear weight of them.
Supreme Member
iTrader: (5)
Joined: Aug 2007
Posts: 1,525
Likes: 1
From: Milwaukee, Wisconsin
Car: 1987 IROC-Z
Engine: 383 with Edelbrock ProFlow EFI
Transmission: TH350
Axle/Gears: 12 bolt 3.73 Eaton posi
Re: SFC's Alstons or UMI?
Could you post a pic of how low they hang?
Supreme Member
Joined: Jun 2005
Posts: 1,800
Likes: 2
From: Bremerton, WA
Car: 1992 RS / 1989 RS
Engine: 3.1L MFI / Vortec 383 TBI
Transmission: T5 / LS-T56
Axle/Gears: 3.42 open / 3.73 Eaton posi
Re: SFC's Alstons or UMI?
From the rear, under the car. I'm on jack stands doing an axle swap and front end work. My SFC's are just a little lower than the GFX, but the exhaust is actually lower.
Joined: Nov 2005
Posts: 2,346
Likes: 1
From: Naples, FL
Car: 91 RS Camaro, 75 L82 Corvette
Engine: LO3, 383 Stroker
Transmission: 700R4, TH400
Axle/Gears: 4th gen 3.23 posi/LS1 discs, stock
Re: SFC's Alstons or UMI?
I would think that SFCs would help creeks more than rattles.
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: SFC's Alstons or UMI?
Damn. Looks nice on yours.
Also, lemme know how it held up to the floor jack test.
Also, lemme know how it held up to the floor jack test.
Thread Starter
Senior Member
iTrader: (5)
Joined: Mar 2007
Posts: 898
Likes: 0
From: Texas
Car: 1987 Camaro
Engine: 5.7
Transmission: 700R4
Re: SFC's Alstons or UMI?
They turned out good. Car feels better. Im happy with them and they arent as noticable as I was thinking they would be.
Joined: Aug 2006
Posts: 12,812
Likes: 110
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: SFC's Alstons or UMI?
hey camaropunk, that a pretty clean looking car you have there
I would definitely get some paint on those welds if you haven't already done so
I would definitely get some paint on those welds if you haven't already done so
Junior Member
Joined: Apr 2005
Posts: 55
Likes: 1
From: Kansas City, MO
Car: 92 Firebird vert
Engine: 388ci
Transmission: 700r4
Axle/Gears: 3.23 open
Re: SFC's Alstons or UMI?
I just had my alstons installed last saturday at a local muffler/welding shop. Round, square, zee channel, alstons, umi or briggs and stratton all I can say is WOW. I could tell the instant that I backed off of the lift. My car is a vert, and they made a huge difference. I recommend SFC's to everybody that has a 3rd gen.
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