A.R. Headers Pics And Dyno Results!!!

[Short-Throw]

Originally Posted by NormV

Quick switch of hats from Mr. SAE to Mr. EPA! Gentlemen, he has them all including Mr. OEM!

Norm

Norm,

White flag waving ....just trying to understand.......

It seems Mikels has clarified and shared truthful facts with us. I welcome that kind of info considering all the misinformation (sometimes deliberate, sometimes not) that gets posted on car forums.

Originally Posted by Am. Racing Headers

RapidRod, What you think are secondary cats are actually resonators.
Nick

Originally Posted by Mikels

They are, in fact, catalysts. CTSV uses a 4 cat system.

I believe in this case Nick made an assumption or got erroneous info. Either way no harm intended I'm sure.

Originally Posted by Am. Racing Headers

The factory system is one of the worst we've seen on any domestic.
Nick

Originally Posted by Am. Racing Headers

If these engines weren't supercharged I'm convinced they'd be down 50 hp because of this exhaust system.
Nick

Nick,

I'm all for people modding their cars and getting REAL benefit, and I also understand marketing, but come on, these two statements are a little far fetched, no?

I've enjoyed aftermarket exhaust systems for decades because of the great sounds they have offered. I've yet to see one show any SIGNIFICANT gain on an honest dyno. I'm speaking sans headers here.

Please tell me what you've found for the kPa back-pressure stock? What kPa delta do you feel to gain 1 HP is required? With long tubes and eliminating the second CAT along with a 'prayer' maybe we can halve the kPa. That still doesn't amount for anything considerably measurable.

I've modded almost every performance car I've owned in some fashion or another.

I'm honestly asking what I'm missing here???????


I'm still willing to set up a track day for CTS-V owners at my club to see real world differences if there's enough interest.


Mike

[Am. Racing Headers]

Mike, We did not measure kilopascals prior to disassembly. One look at what the factory (is forced to) equip these vehicles was enough to warrant an exhaust upgrade. Look at the dyno results alone. I stand by my statement that the factory system is highly restrictive and that a normally aspirated LS3 would be down at least50 HP with this system. With regards to the secondary cats, MikeL was right and I stand corrected. We have the system here and we did a little "investigating". I'll be in contact with the engineer on Monday for further clarification. He called them bottle resonators and I'm wondering if GM used them partially for that purpose. Mike I'm not sure if you own the new CTS-V but if you do, please get it up on a lift and have a look. I promise you a good laugh while you're scratching your head.

Nick

[haterinc]

not to mention w4m picked up 18 dyno hp just by removing the exhaust...

[Hogg]

I wouldnt be too concerned will regaining lost boost due to a less restrictive exhaust. Boost is a measure of resistance through a system.

I would rather have 6 psi of boost through a low restriction setup, than 9 psi of boost through a restrictive setup, all else equal.

Folks get 2 caught up on boost numbers. A loss of boost by removing restrictions NEVER results in power loss.

Always judge mods by trap speed or dyno numbers, not boost numbers.

peace
Hog

[thebigjimsho]

Originally Posted by Hogg

I wouldnt be too concerned will regaining lost boost due to a less restrictive exhaust. Boost is a measure of resistance through a system.

I would rather have 6 psi of boost through a low restriction setup, than 9 psi of boost through a restrictive setup, all else equal.

Folks get 2 caught up on boost numbers. A loss of boost by removing restrictions NEVER results in power loss.

Always judge mods by trap speed or dyno numbers, not boost numbers.

peace
Hog

Bingo!

[Razorecko]

heck if you can drop 2psi after some mods and still gain hp thats great. That means you can add the 2psi to stock level with a pulley and make even more power will still pushing the blower to its general oem limit.

[JTHennessey]

Direct Link to American Racing Headers

We look forward to getting these headers out to the forum members asap. Feel free to call me at the shop if there is anything you need.

979-885-1300

Thanks
James

[colbachlaw]

James,

Thanks for the link.

You just sold one more pair.

The PayPal payment option is a great idea, as it makes it a piece of cake to buy them.

Can't wait to pick up my car so I have something to bolt them to.

Mike C

[JTHennessey]

Originally Posted by colbachlaw

James,

Thanks for the link.

You just sold one more pair.

The PayPal payment option is a great idea, as it makes it a piece of cake to buy them.

Can't wait to pick up my car so I have something to bolt them to.

Mike C

Mike:

Thank you for the business and we look forward to getting you a tracking number asap. When do you pick the car up?

James

[Tasos]

I would love to do the full header/exhaust system, but now after reading this thread I am left with a few concerns. Maintaining the factory warranty is of great importance to me. I understand that the exhaust won't be covered under warranty, but the issue with codes bothers me. I planned on purchasing a tuned ECM from W4M and exchanging it with the factory one everytime I had warranty work done, but now will the computer throw a code when I put the factory ecm in for servicing? Everyone knows how GM has more recently been looking for reasons to void warranties.

[colbachlaw]

James,

I pick up my V from Superior Cadillac on 4/3.

Once I get it home, the CAI, Jesse's tune, and the headers go on and then it is off to the dyno.

Would you recommend coating the headers?

Mike C

[JTHennessey]

Originally Posted by Tasos

I would love to do the full header/exhaust system, but now after reading this thread I am left with a few concerns. Maintaining the factory warranty is of great importance to me. I understand that the exhaust won't be covered under warranty, but the issue with codes bothers me. I planned on purchasing a tuned ECM from W4M and exchanging it with the factory one everytime I had warranty work done, but now will the computer throw a code when I put the factory ecm in for servicing? Everyone knows how GM has more recently been looking for reasons to void warranties.

Manufacturers such as American Racing and professional shops like ours work very hard to insure the items can be installed with no concerns. Concerns do include Check Engine Light not being on and the car not going lean. If you have a stock ecm, you will be fine. If you have a tuned ECM, let the tuner know you do have Long Tube Headers & High Flow Cats.

If you are concerned about your warranty, become familiar with the Magnuson-Moss Act... Wiki Information for a General Overview.

[JTHennessey]

Originally Posted by colbachlaw

James,

I pick up my V from Superior Cadillac on 4/3.

Once I get it home, the CAI, Jesse's tune, and the headers go on and then it is off to the dyno.

Would you recommend coating the headers?

Mike C

Coating the headers will help with the heat under the engine bay, however unless you are tracking the vehicle, you may not see any benefits.

Speak to you soon,
James

[SSideways]

Nick,

Do you also have a complete 3" mid pipe section, to use with a Corsa exhaust.

I noticed on Hennessey webpage it's 3" to 2.5" to mount to stock exhaust.

thanks DC

[Am. Racing Headers]

Originally Posted by SSideways

Nick,

Do you also have a complete 3" mid pipe section, to use with a Corsa exhaust.

I noticed on Hennessey webpage it's 3" to 2.5" to mount to stock exhaust.

thanks DC

SSideways, I'd check again with Corsa. I'm pretty sure their system at the very least starts off at 2-1/2". Our system ends at the rear axle. I need to check where their system starts. If theirs starts further back then a portion of the factory 2-1/2" pipes will need to be used.

Nick