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Best flowing 3" cat

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Old Jun 18, 2001 | 05:44 PM
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98_1LE's Avatar
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Best flowing 3" cat

Which 3" cat, w/o AIR, will make the most power on a modded TPI motor? It will be sandwiched between SLP 1.75" headers and a SLP 2OTL cat back.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association
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Old Jun 18, 2001 | 11:02 PM
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Anyone???

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association
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Old Jun 19, 2001 | 01:18 AM
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From: Esquimalt BC
I hear catco is pretty good
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Old Jun 19, 2001 | 01:37 AM
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From: NW FL
NONE!
Actually I heard that it is good to have a cat in tpi engines because they need back pressure is that right
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Old Jun 19, 2001 | 08:54 AM
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From: Northern NJ
Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Catco are a cheap replacement. Although not the worse quality, i don't think that they are the best. They are stainless which is cool. I hear that Random Technologies have the best cat.. a little pricey though.
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Old Jun 19, 2001 | 03:27 PM
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Random technology cats are best, but you are going to pay for it. They cost around $200-250, but flow almost equal to a strait pipe.
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Old Jun 20, 2001 | 03:58 PM
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From: Readsboro, VT
Car: 85 IROC-Z / 88 GTA
Engine: 403 LSx (Pending) / 355 Tuned Port
Transmission: T56 Magnum (Pending) / T5
Axle/Gears: 3.42 / ?
I have a 3" dynomax and I felt no difference between that and a straight pipe.

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