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      10-19-2012, 03:06 PM   #1
Spoolin Montego
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Exhaust a Big Deal for FBO

I'm currently FBO, minus midpipe and cat-back exhaust. Does this make a large performance increase? Looking for people that ran cobb stage 2+ with stock midpipe and exhaust then upgraded at a later date.
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      10-19-2012, 04:05 PM   #2
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Gains are small... 5-10hp mostly felt and heard mid range.
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      10-19-2012, 05:04 PM   #3
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at the power levels youre runnning i could see 10 or so hp from catless mids, maybe like 1-2 from the axle back portion lol. swapping out n54 mids would be a good move, theyre utter garbage in every respect.
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      10-19-2012, 06:14 PM   #4
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Quote:
Originally Posted by 135Pats View Post
at the power levels youre runnning i could see 10 or so hp from catless mids, maybe like 1-2 from the axle back portion lol. swapping out n54 mids would be a good move, theyre utter garbage in every respect.
I agree with that^^^

I just dyno'd today 405hp and 479tq
On monday I'm having my mid cats removed and some resonators welded in place

There is a thread I created about it. I will post up my numbers after we fab it
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      10-22-2012, 06:30 AM   #5
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Quote:
Originally Posted by theinfamousdrew View Post
I agree with that^^^

I just dyno'd today 405hp and 479tq
On monday I'm having my mid cats removed and some resonators welded in place

There is a thread I created about it. I will post up my numbers after we fab it
Interested in your results.
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      10-22-2012, 09:15 AM   #6
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I think there are a lot of folks tuned into this.......thanks for dyno-ing!
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      10-23-2012, 09:18 PM   #7
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****UPDATE****

So yesterday we removed the secondary cats.
I let it adapt for a day and went back to the dyno today.

The results are.......
416HP 488TQ!!!!!!!!!!
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      10-23-2012, 09:47 PM   #8
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man thats alot of torque.
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      10-24-2012, 03:51 AM   #9
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Nice!

Are you going to try the axle-back part next?
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      10-24-2012, 07:12 AM   #10
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Originally Posted by JamJay View Post
Nice!

Are you going to try the axle-back part next?
Maybe...
Im actually pretty happy with it the way it is.
It still sounds stock however, you can hear the turbo more.

Also I still have my oem clutch and all this torque worries me.
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      10-24-2012, 08:02 AM   #11
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there was a dicussion about this on n54tech and I think someone mentioned that the 135 axel back was more restrictive than people think it is and that gains can actually be seen from replacing it.

Those are some nice numbers, I pulled 440/520 on a dynojet and I have replaced all exhaust sections. If you want I can whip up a video and send it to you, I have AR cat-less DPs, berk mids and rogue axel back.
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      10-24-2012, 08:05 AM   #12
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Originally Posted by JK135i View Post
there was a dicussion about this on n54tech and I think someone mentioned that the 135 axel back was more restrictive than people think it is and that gains can actually be seen from replacing it.

Those are some nice numbers, I pulled 440/520 on a dynojet and I have replaced all exhaust sections. If you want I can whip up a video and send it to you, I have AR cat-less DPs, berk mids and rogue axel back.
Stock clutch?
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      10-24-2012, 08:09 AM   #13
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yup, when I get back stateside I'll be getting the HPF one.
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      10-24-2012, 08:10 AM   #14
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Any slippage?
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      10-24-2012, 08:17 AM   #15
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nope and I'm using the G5 ISO firmware with 70/30 93/E85 and that pulls really hard.
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