Exhaust and CAT ramblings / stainless welding - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-12-2004, 09:58 PM   #1
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Default Exhaust and CAT ramblings / stainless welding

I am researching a new CAT for my car and I like the ones by random technologies.

They claim I can replace mine with a 10.5" long 4" diameter metal matrix CAT that will flow more than the stock unit. Apparently they use this same CAT on a downpipe they make for the Grand Prix. (please make some for the Bonnie!!)

Anyways, I can get one of those, or I can go have a magnaflow installed. Just wondering if anyone has some experience with either product.

I talked to someone at a popular custom exhaust place in this area, and I asked them if they used stainless mig wire to weld stainless exhaust systems. Well, they said no, they just use regular steel. I happen to know that this is not the correct way to do it, and if anyone knows of a place in the Boston or southern NH area that does it right, please let me know.


I have researched this a bit and exhaust systems are usually 409 stainless steel. If I could find a small amount of MIG wire of the 409 type I might even attempt this myself.

1992 green ssei. Tan leather, moonroof, power everything. 161k miles
Goodyear RSA Plus 225/60/16 VR on chromed factory crosslace rims. McGard chrome lugs.
Audio system: CD player w/equalizer, subwoofer (all stock).
Delco premium wires, NGK TR55 plugs, K&N stock style air filter. Ceramic brake pads. New rear brake tubing and proportioning valves. New wheel cylinders, front rotors and calipers. New front wheel bearings. Replaced crank sensor and harmonic balancer. Rebuilt instrument cluster. Cleaned A/C evaporator. Valve cover gaskets. Alternator. Front stabilizer links. Replaced all power steering lines and transmission lines. Cleaned MAF and IAC. New door appliques. Rebuilt steering gear. CERAMIC brake pads, I love them. I am listing all this in case someone needs advice on any of these repairs.
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