buckmeister2

Folks,

I have a chance to buy a complete exhaust-manifolds to mufflers- off of an '07 Z06, which I would put on my '12 base with A6.

Will there be fitment issues that are more than just bending the pipes a little bit?

HOXXOH

I'll assume your '12 has the standard mufflers and you plan to add a NPP in a box for control.
The left side is no big deal, but the right side over-the-axle pipe has clearance issues with the A6 and may need some serious heated persuasion.
If you already have NPP on your '12, the simple way is to mod the back end of the Z06 H-pipe with 3" to 2.5" reducers to fit your current NPP mufflers and then sell the Z06 mufflers.

peter pan

Did this to our 09 Coupe years ago, was not a NPP model and mechanic did the install, he dimpled where needed by the A6 and all is good

demon340

buckmeister2

Thank you, all, for the info. I have done this before, with the a base muff setup, and had to do quite a bit of massaging to match up the pipes, but it worked fine.

HO, I really like the look of the larger Z06 tails. I am going to do the install myself up to the point of joining/or changing out muffs. I will have my exhaust guy take a look at that point and get his opinion on which will work best.

Yes, I do know about the extended sensors, and have them on my ebay watch list. Interestingly, when I did this mod to my '08, the O2 that was taped back only had about 6" extra. I had to drive it without the second sensor connected for a few days until I picked up an extended sensor. I have read that I am not the only one who did not have sufficient harness wire folded and taped. Odd that some have a lot of wire available, and some have very little.

96GS#007

You'll need a little massaging on the passenger side over-axle 3" pipe with the A6. Other than that....o2 extenders, bolt it up, done.

buckmeister2

A bit more info now...I have talked to three local custom exhaust shops, and nobody wants to touch it. They say it can't be done without building a new mid-pipe. As soon as I mention, "not according to my friends on corvette forum", they act like I'm an internet idiot.

Vegas is a strange place for high-performance. We have a nationally-acclaimed drag strip in town, but I can only find one shop that does dyno tunes, and the guy is a total ***. And, nobody seems to want to do what is a fairly straightforward exhaust mod. I can do all but the muffs myself, but I don't want to drive around for days looking for someone to complete it after I get started. Man, this is frustrating....

BTW, my car has non-NPP, so I will be using the complete Z06 system.

VETFEVER

Are you doing this for appearance purposes? The larger pipes could actually hurt performance...

buckmeister2

No, it is not for appearance purposes. The Z06 manifold is a 4-into-1 design, and functions as a shorty header. Also want the benefit of NPP, which my car does not have.

I have occasionally heard that there are situations in which an oversize exhaust can interrupt the exhaust pulses (creating backpressure?). But, that was in extreme alterations, such as going from 2" to 4". On our engines, it seems the best torque and HP is derived from running LT headers with 3" dumps, which is the size of the Z06 pipe.

I am always open to hearing new info, so if there is some evidence that a 3" system, compared to a 2.5" system, will hurt performance, lay it on me.

Even if it does have a potential 2-3HP negative, that will be easily made up with addition of better flowing manifolds, and NPP.

Mike's LS3

The Z06/ZR1 exhaust manifold is 4 into 1 at the collector, just like a shorty header.

With a tune you should gain HP throughout the entire power band. BTW: The Z06 and ZR1 mufflers are a little less than 3" at the entrance of the muffler, not that it will affect any performance because the reduction is further downstream.

96GS#007

They’re confusing trying to put a base ‘05-‘08 exhaust on an ‘09 & up.

As mentioned above, the passenger side over axle pipe needs some massaging to clear the A6, but that’s it.

buckmeister2

Jim, I am putting an '07 Z exhaust on a '12 base with A6, which I have read is no big deal, other than the massaging of the pass. side over the axle. I have explained that to them, and they still look at me like I have 3 eyes.

There is another shop, highly recommended, which I will go to on Monday to see what they say. Heck, I'm installing the manifolds, cats, and H-pipe...all I need is someone to do the bends/mods for the Z muffs.

VETFEVER

You are pretty informed. Only thing I would add is to get tune done...

demon340

96GS#007

Since you’re doing most of the work, I’d just tell the shop....
“I need you to install a set of mufflers. The passenger side will likely need a little massaging since the mufflers are for a manual transmission car”
....that cuts all the drama since only a Corvette specialty shop that knows the C6 would understand the details.

1 other tip you can give them....Remove the rear sway bar brackets (not the end links) and rotate the bar down. Gives more clearance.

JasonAndrew

I am looking into the same situation. Much easier on the manual cars.
Can you list any part numbers when you come across ? I was also wondering if installing the 3 inch exhaust will hurt the performance of my LS2. There is a post on the forum that does a DIY NPP controller wtih a ford vacuum pump. I was thinking something along that route.