Mopar Jimmy

The Corsa Extreme X Pipe (and recently installed Nitto drag radials 345/30/19) are the only mods to my 2016 Z with A8 trans.

I see that one very knowledgeable and accomplished drag racer here has lost low end torque with just the Corsa X Pipe and ran slower at the drag strip, and went back to the stock X pipe (with its 2 rear cats) and ran faster with the stock X Pipe and cats in his M7 car. Part of the theory on this is b/c the Corsa X Pipe is a 3 inch pipe and we know on a stock car bigger pipes can cost you low end torque. As most know the stock and Borla X Pipe are both 2.75 inches.

Now I love the extra sound that I get out of my car (which is way to quiet for me stock) with the Corsa Double Helix X Pipe but am not looking for any mods that might make my car slower in the 1/4 mile.

Has anyone else been able to confirm a loss of low end torque in either that M7 or A8 tranny C7 Z by way of trap speed at the track, 60 foot times or et, or on they dyno, when compared to the stock X Pipe?

Z0Sick6

Are you talking about the Corsa Double Helix X pipe? Never heard of the corsa extreme x pipe

http://marylandspeed.com/corsa-30-do...61-p-5622.html

There is a link for reference.

Dfwz06

That's like saying that you'll lose torque from putting on headers.

ajrothm

I HIGHLY doubt the car lost power from the X pipe.. Its much more likely it lost power from bad air at the track on the night with the X pipe on. I'd need to see the DA from both nights to believe it had ANYTHING to do with the x pipe...

Another thought is maybe it had a tank of weaker octane fuel in it and it was pulling timing or something. (not all 93 octane is always the same)


That's just like people saying that headers kill torque and that couldn't be further from the truth...on the contrary, they almost always gain torque...

Definitely something else contributed to the loss of performance on that one night...IMOP.

Mopar Jimmy

Yes, that is what I am talking about.

Translator

I do not think that the X pipe will cause a power/torque loss either. I remember that back in the 03/04 Cobra days, larger diameter cat-backs and X pipes would increase power throughout the power band and improve ET's as well. The stock ones were REALLY restrictive though. Perhaps the X pipe in the Z06 is not that restrictive? One would think that the smoother mandrel bent pipes and elimination of the two rear resonators would improve HP/TQ though.

3 Z06ZR1

I think the same source thinks that headers offer no power on the LT4 either. The story about the 3 pipe losing to the stock 2 3/4 is wrong too! The stock intake is a restrictive piece of crap.
So you may not get much gain with any of the mods like you should until you scrap the stock intake.

tail_lights

When I do start modding this was one of the first mods I was considering.... Interested in the findings

Adam Silver05

Would this require a tune?
If no tune, will it trip the check engine light or log any faults?
Will the car have a gassy smell at the back that is the norm when all cats are deleted from any car?
How hard is the install?
Will it work with the stock mufflers and the different exhaust modes?
Is there any downside?

Mopar Jimmy

No codes it only deletes the rear cats that are behind the 02 sensors so no smell, no codes, no downside whatsoever except at least one person (not me) right now believes b/c its a 3 inch pipe and not a 2.75 inch x pipe like the stock one or Borlas, that it loses some torque on the low end of the rpm band that affects the acceleration of the car. Works with stock exhaust and 0 gas smells since your 2 main cats are still in place and unaffected by this. Took my Chevy dealer about 1/2 hour to install. I certainly recommend it as it makes the car sounds considerably more aggressive and exotic sounding. This mod is done strictly for better exhaust sound and louder and not for performance.

Youtube search should allow you to find a couple of videos with a C7 Z with just this mod (that sold me) b/c the car sounds bad azz especially when hot rodding it.

phantasms

Just go Borla. It sounds so good and is so cheap and makes no seat of the pants difference.

BJ67

I find it hard to believe a smoother bent x-pipe with out rear cats does not offer a performance gain. The exhaust has to flow better with less restriction. I have done the Borla unit, car definitely pulls harder and stronger to redline. The sound is the extra bonus.

C7/Z06 Man

Check out the C6 forum.

They make 1 3/4", 1 7/8" and even 2" primary tube headers for the LS3. You will even have the manufactures tell you that the 1 3/4" headers make more torque down low in their own brand and about/or the same hp as the 1 7/8" headers on the top end. So the 1 3/4" car all things being even except the diameter of the primary tubes usually wins the race.

I went from a 12:31 @115.75mph with my "stock" present to this day Grand Sport 1/4 mile record holder to 11.32 @125mph with just a set of 1 3/4" headers, a Home Made CAI from a stock intake and a second hand DiabloSport "canned" tune on sticky tires. With these mods the car was now faster than any standard/lighter bodied LS3 with the same type of mods. I have nothing against headers, turbos, superchargers, etc.; just do your homework and purchase wisely.

Bottom Line: As has been said, bigger is not always better. You match the parts for the performance level (HP) you are shooting for.

Examples: A larger turbo will produce more psi (HP) than a smaller one, once it gets spooled up and piston ring gaps can gain or lose 20/30+ HP depending on what they are set at.