th3brandon

With a cutout what kind of hp gain may i see???....and will i notice it in a 1/4 time as well?????? I have tryed a search just seeing what u guys think... some people said up to 2ths???.... now i dont know about alll that lol

insanez

iTrader: (7)

I saw a 5 hp and 6lbft over my closed exhaust with pacesetter lts and offroad y-pipe. not bad for 25 buck from summit

nomoneyz

iTrader: (15)

I gained 10hp and 1tq on the dyno going from closed to open on a stock exhaust. Dont have any track numbers though.

jasonp31

10hp and 1 lb of torque? You have some huge headers on that thing or what? LOL.

projekt70chevelle

iTrader: (4)

My car feels like it picks up, but that may be because the previous owner put a 2.5" flowmaster out back :/ Although i have seen a mustang gain a little over 15hp on a dyno. He had dual cutouts right after the headers, but still same idea i suppose.

wg871

iTrader: (15)

My buddy has a hooker catback on his z28, and picks up 5 with an open cutout. It all depends on how restrictive your catback is.

95CamZ

iTrader: (3)

It depends on what kind of exhaust your are running now b/c if you have a really low restriction exhaust you wont see as much compared to it on a choking stock exhaust!!

jasonp31

It depends on more than just your catback. It depends on your engine's total ability to pump air.

95CamZ

iTrader: (3)

^true! skipped right over that!!

skinnies

iTrader: (33)

On heads/cam cars I've seen between 10-13rwhp with open cutout vs stock catback, my own personal experience and with friends cars.

1995ta383

My car runs like **** when i have open headers. I would put money on my car loosing power with open headers.

Tireburnin

iTrader: (42)

When my car was a 6spd with a flow master I picked up 33rwhp and around the same torque by opening cutouts right off the headers. Flowmaster + crushbent exhaust = bad for power.

I would pick up 2-3mph with them open.