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Thank you for the further info. While I don't agree with all you wrote, I also know that you are basing it on your own experience. I have found that a manual trans usually eats 14%, and 6-spd auto about 18%. I have also experienced zero HP increase on a dyno for a Callaway intake. How you got to 414HP does not matter...I am thrilled for you. I would love to get that number with the same mods. My only current mod is a complete Z06 exhaust install, front to back, on 2012 base with auto. trans. (yes, it was a real pain to install). I will be doing long tubes, intake, and tune in 2021. I will remove the entire Z06 exhaust, and sell it at that time. I have an extra set of 3" dual-mode muffs that will go on the car with the headers.
I would consider a set of used long tubes if anyone has some that are decent, and reasonable in price (50% of new is reasonable to me).
Very interesting.... I did not realize that STD was not SAE corrected. I assumed incorrectly that STD meant the same as SAE. Thanks for the info.... from everything I'm reading it appears the only thing a dyno is good for is checking what mods will do on your car on the same dyno under the same atmospheric conditions.
My ultimate goal is to get about 100 HP more to keep me above the average late model Camaro/Mustang/Charger/Challenger in order to keep them in my rear view mirror !!!
If I were to go the Z06 manifold and X pipe direction will LS3 parts fit my LS2 (2005)?
You cannot do the Z06 manifolds without getting the Z06 cats. The base cats are completely different. Also, the spread at the rear of the x-pipes was changed in '10. The later x-pipe will not match up with the earlier muffs. If you want to do the switch, try to find a complete Z06 system, front to back, any year. If you buy pieces, be sure the pieces you get are from a pre-'10 C6. Once you have all the matching parts, they will go into your base or GS with manual trans just fine. The auto trans can be done with 3", but it will need a drop-down to stock pipe at the auto trans linkage.
[QUOTE=Big Red Ram;1602695041]ok is this what i am looking for?
LS7 Z06 manifold with gutted cats off a 2011.
Yes, although I think the gutted cats will cause a code .
NOTE: If you want to retain your stock 2 1/2" x-pipe, you will need to hack off the front flares, and weld in sections of 3" flared pipe that match up with the Z06 cats, and retain the same OAL of the x-pipe. There is zero loss of HP going from 3" to the smaller pipe.
if you want to use a 3" Z06 x-pipe, it will bolt right up to the cats, but you will have to add a reducer at the rear for the stock muffs. It is easier to use the 3" x-pipe because you will be adding the reducer at a straight section. If you use your 2 1/2" stock x-pipe, adding the flares at the front to match to the cats is a bit tricky. Plan it out carefully, make sure it will be right.
Just for clarification, here are some pics of the differences between a pre-'10 x-pipe, and a '10-later x-pipe. The pipe in front is the older. It is about 2" longer overall, and 1 1/2" wider at the exit. You can easily tell which you are working with as the '10 and later x-pipe has two non-op cats. If your x-pipe has two cats, it is '10 or later. If not, it is '09 and earlier.
The gov. mandated the extra non-op cats. They have no sensors.
lots of good info here, just what I was looking for.
Not too excited about gutted cats throwing a code, can anyone confirm if that is the case after gutting the Z06 cats?
Next question is if I were to go with this 2011 manifold and downpipe then a 3" x Pipe from Corsa or another MFG can I then reduce it it down to 2.5" to fit my NPP?
lots of good info here, just what I was looking for.
Not too excited about gutted cats throwing a code, can anyone confirm if that is the case after gutting the Z06 cats?
Next question is if I were to go with this 2011 manifold and downpipe then a 3" x Pipe from Corsa or another MFG can I then reduce it it down to 2.5" to fit my NPP?
Thanks Much!
I can't think of any reason that any pipe cannot be reduced. You will want to be sure whatever x-pipe you use has the correct spread at the back to fit your muffs. What year is the car?
Last edited by buckmeister2; Dec 22, 2020 at 08:42 AM.
My car is a 2005 but the previous owner added the NPP exhaust since I dont believe you could get NPP in 2005.
So if the rest of the exhaust is stock the added NPP's must be from a pre 2010 car. My X pipe then would just need to be pre 2010 which would then mate to the Z06 manifolds. I would need to reduce to fit the 2.5" NPP.
Sound about right?
Only question then I believe is will the gutted cats throw a code?
There were no Z06 X-pipes until 2011. The pre-'11 through '09 H-pipe has the wrong angle to make it fit properly on an '05-'08 if you try to use the whole Z06 system. What you'd need is an '08 or earlier Z06 H-pipe. You can use any Z06 H-pipe if you intend to keep your current 2.5" over-the-axle pipe. Of course, that assumes the previous owner simply cut the OEM pipe off at the muffler and welded the Z06 muffler in place.
Do a search for "hoxxoh Z06 to base conversion" . I've written so much about this that it could be a sticky.
Very interesting.... I did not realize that STD was not SAE corrected. I assumed incorrectly that STD meant the same as SAE. Thanks for the info.... from everything I'm reading it appears the only thing a dyno is good for is checking what mods will do on your car on the same dyno under the same atmospheric conditions.
My ultimate goal is to get about 100 HP more to keep me above the average late model Camaro/Mustang/Charger/Challenger in order to keep them in my rear view mirror !!!
Thanks for the info guys!
Dyno numbers are simply a point of reference. Timeslips tell the real story. Those stock late models run mid to low 12's in the quarter and easily quicker with mild mods.
Just as a comparison between dynos and timeslips, my last dyno pull netted 394 HP and a couple weeks later at the track I ran 10.80.
Dyno numbers are simply a point of reference. Timeslips tell the real story. Those stock late models run mid to low 12's in the quarter and easily quicker with mild mods.
Just as a comparison between dynos and timeslips, my last dyno pull netted 394 HP and a couple weeks later at the track I ran 10.80.
Wow, 10.80. Your car is set up right. That's fantastic. I'm still dreaming of an 11 second car, you have me thinking about 10's now. LOL.
Wow, 10.80. Your car is set up right. That's fantastic. I'm still dreaming of an 11 second car, you have me thinking about 10's now. LOL.
You'll need to learn how to tune, get lots of seat time, and understand a whole lot more than just the basics if you only add boltons. It'd be a lot easier with a cam and head work or a blower/NOS, but not nearly as satisfying.
You'll need to learn how to tune, get lots of seat time, and understand a whole lot more than just the basics if you only add boltons. It'd be a lot easier with a cam and head work or a blower/NOS, but not nearly as satisfying.
Considering headers on a stock 2005 C6 base. Originally I was gong to do a cat back exhaust just to improve the sound. After looking at pricing I have found that putting headers and an X pipe is about the same cost as a cat back muffler package. My 2005 has NPP mufflers but they are not hooked up so they are always on the wild side. If I went with headers I would hook up my NPP's to calm the sound down around town and with the boss in the car. Some posts seem to suggest that on a stock engine it may not be worth the trouble to add headers, pain to install, more heat issues etc.
As I mentioned my car is stock and I plan to keep it that way for the near future. My reasons for mufflers only is better sound, reason for headers is better sound AND increased HP. Car is just for fun no racing planned, maybe a track day just to see what she will do.
So are headers worth the investment or stick with the cat back system and just make pretty music?
Hey Big Red. I am south or you in IL. I have Z06 manifolds, and cats , and the Z06 Bi-modal mufflers that I originally bought for my 05. You would only need the h-pipe from a Z06 for a complete setup. I honestly don't think I am going that route as of now. Let me know if you want them. They are bulky (3 inch exhaust is no joke) which would be better picked up than shipped.
Jay
Last edited by JasonAndrew; Dec 24, 2020 at 10:58 AM.
