high flow cats without headers?
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2nd Gear
Joined: Dec 2007
Posts: 2
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high flow cats without headers?
Does anyone make a set of high flow cats and pipes for the o2 sensors that will bolt up to the stock exhaust manifolds? I am looking for a direct fit application so there isn't any or very little fabrication. Also need an X pipe. Any information would help. Thanks: Chris
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I seriously doubt it. Adding high flow cats to a stock set up will NOT net that much HP. Maybe 3-4 if your lucky. Save your cash and get a set of Long Tube Headers and a X midpipe with HF Cats. Then you will pick up 25+ HP.
Some C5's had Pre Cats off the exhaust manifolds and then main cats down lower. If your stuck using OEM stuff, get a hold of a ZO6 exhaust system from the manifolds to the midpipe and you will gain some HP with that set up if you have the Pre cats. The lack of Pre Cats and the better manifolds made more power. Some of the late model C5's came with ZO6 style manifolds.
Bill
Some C5's had Pre Cats off the exhaust manifolds and then main cats down lower. If your stuck using OEM stuff, get a hold of a ZO6 exhaust system from the manifolds to the midpipe and you will gain some HP with that set up if you have the Pre cats. The lack of Pre Cats and the better manifolds made more power. Some of the late model C5's came with ZO6 style manifolds.
Bill
Intermediate
Joined: Sep 2008
Posts: 37
Likes: 2
From: Waco Texas
I seriously doubt it. Adding high flow cats to a stock set up will NOT net that much HP. Maybe 3-4 if your lucky. Save your cash and get a set of Long Tube Headers and a X midpipe with HF Cats. Then you will pick up 25+ HP.
Some C5's had Pre Cats off the exhaust manifolds and then main cats down lower. If your stuck using OEM stuff, get a hold of a ZO6 exhaust system from the manifolds to the midpipe and you will gain some HP with that set up if you have the Pre cats. The lack of Pre Cats and the better manifolds made more power. Some of the late model C5's came with ZO6 style manifolds.
Bill
Some C5's had Pre Cats off the exhaust manifolds and then main cats down lower. If your stuck using OEM stuff, get a hold of a ZO6 exhaust system from the manifolds to the midpipe and you will gain some HP with that set up if you have the Pre cats. The lack of Pre Cats and the better manifolds made more power. Some of the late model C5's came with ZO6 style manifolds.
Bill
I wouldn't waste the time or money. There will be no noticeable gain and you will be out several hundred dollars.
