RANDOM NOTES: My car has no cats (Needswings downpipes) and I picked up over 20 hp with the cutouts open on the top end. (over 10 closed) I would guess I lost about 20 ft. lbs. of torque down low. The ECU adjusted over time and the car is much stronger on the top end. I passed emissions just last week. (no visual) The car was cleaner at 2500 than at idle. No codes thrown. The exhaust stinks now. For a daily driver I'd keep the primary cats. I'm trapping at 112.9 in the 1/4 mile. Just the facts according to me.

Les