I am planning to purchase a cutout for my car just because I love to hear my car roar. But what type of gain do I get from a Exchaust Cut-out?

 

I would say its pretty decent gain... I think i remember some people saying a 10Hp gain over their aftermarket muffler... so, probably 15hp... You lose low end power and torque, but you can tell the top end power is alot better

 

I will have to agree with the above. I just had mine installed a few days ago, and I can notice a difference when it closed and when it is open. I think it is a worth while mod.

Cameron

 

does your electric cutout leak?

 

get the DMH cutout, mine doesn't leak at all

 

I have a McCord cut-out, and it also does not leak at all, and it costs ~$120

Cameron

 

I did some testing with my cutout. Same night, same conditions.

1st run, cutout closed, 2.1 60', 9.108 @ 78

2nd run, cutout open, 2.1 60', 9.108 @ 78

I am not lying, and if anything the conditions were better for the second run as the night was progressing. I figured that after that first 9.108 I would at least get a 9.0X later in thte night, but nope, I even left it open through the night and never got better.

So, if there is a difference, the 1/8th mile doesnt show it. I think alot of it must be the driver hearing new sounds

-James

 

I think it helps more if you have a more restricted exhaust. My cat back is a custom 2.5" after the y-pipe(no cat), going through a flowmaster big block muffler. On the dyno with it closed it put down 339rwhp/380rwtq. Open, it put down 351rwhp/364.9rwtq.
At the track with it closed, it ran a 13.305@105.4. Open it ran 13.03@107.6. Same conditions, lane, and launch technique.

 

I gained 7 RWHP with my cutout open on the dyno, and this is with the bad fuel pump causing the LEAN condition listed in my sig. I don't doubt the 10 HP gain if my car was running right.

 

I gained 7rwhp 9 ft/lb with mine. Back to back dyno pulls first pull capped, second pull open. And that is on the stock choker manifolds. Hope this helps.

 

you gotta love that sound.

 

so you gained 12 rwhp and lossed 15rwtq???
-brandon

 

Yep. My old cat back was a piece of junk, it really restricted exhaust flow. I guess I lost the tourqe because there was basically no back pressure. Oh well, the old exhaust is gone and I now have a bullet muffler and a turn down...

 

12.25 with the cut-out closed...12.05 with it open. Mine is a manual type, from Jegs. It's located in my ORP.

Frank

 

is there room on a single cat car to place it before the cat.convertor?