High flow cat converters?
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Big block ended in 74. Cats started in 75. What year car-engine and what state's emissions? North Carolina? No emissions 95 and older cars.
Last edited by derekderek; May 24, 2019 at 02:24 PM.
Thread Starter
Racer
Joined: Aug 2011
Posts: 429
Likes: 24
From: Charlotte NC
This is entirely custom to prevent some harmful emissions provided it’s not too much of a sacrifice on power etc. Flowmaster makes some for hot rods with headers and performance exhaust mufflers but was hoping for some recommendations.
Drifting
Joined: Jun 2012
Posts: 1,990
Likes: 183
From: Port St. Lucie Fl
CATs take the rasp out of an exhaust system, the cats from LS cars a supposed to be little to no loss but no proof either way. research them and find the one that offers the highest flow number is my guess.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
They are fine and last a long time. Catco, Manaflow etc make them. Use an o2 sensor to tune if you use them and heat shielding.
They dont sap a ton of power like the old pellet style did. Using headers with smog tubes? Manifolds seem to choke BBC
They dont sap a ton of power like the old pellet style did. Using headers with smog tubes? Manifolds seem to choke BBC
Last edited by cv67; May 24, 2019 at 02:57 PM.
