Catback hp gains??

[mralbuquerque]

I've seen the magnaflow catback on a stock 08 make 11 hp 12 ftlb's torque. I saw a post by 351Carlo that showed a 1 hp gain on basically stock vehicle with the Corsa catback. I spoke to one vendot that said 15 hp gain with a catback on a basically stock vehicle.

Thoughts or dyno evidence to support one way or the other???

 

[351carlo]

I'll bet the house that with an otherwise stock vehicle you will not pick up 15 HP by a catback alone.

I'm not in the business to sell parts, I'm not in the business to sell services. I do have a dyno, and I do have the tuning software, but strictly for personal use. I have nothing to gain or lose by saying it picked up near nothing in the horsepower department and merely a few ft-lbs of torque.

 

[mralbuquerque]

I have a friend who added a corsa catback to his car and got a zero hp gain. I would have thought there would have been a few hp gain due to eliminating the crossover pipes. Maybe the other catbacks flow much better??

 

[bluesrt]

they only hp gain you will get is from bigger exhaust, and will rob bottom end torque,but will improve hp at 120 mph and up- wide open- top end

 

[Tail lights]

On my 2001 gts, I installed corsa larger diameter(3inch as opposed to there 2 -1/2 inch system) cat back. Then I installed a set of ARH headers, I remove my cats completely. Now it's 3 inch front to back. My car definitely has more midrange grunt, But on the dyno, No increase in power. I'm hoping with a Computer retune I will pick up power. Also as I build my motor( its stock now) I expect the headers to show more of anthe increase in power. Any and all feedback is appreciated, Thanks