MTPZ06

Love the bright red disclaimer in larger font towards the bottom of their ad:

"Remember, you get what you pay for. If you buy a cheap generic brand, please do not expect the nice quality, perfect fitting item. It may require professional modifications to make it fit."

At least they're honest...

Mopar Jimmy

The Corsa X Pipe I had b/f I sold my C7 Z had ZERO drone and sounded really good as these x pipes get rid of the rear cats without throwing codes as the rear cats are behind the 02 sensors.

Hard to describe the sound other than its bad azz vs. stock. Look it up on youtube aor better yet find someone local to you who has this mod done but for the $ you CAN'T go wrong if your are looking for a sig. more aggressive sound over stock!

capevettes

My Borla, catless X-pipe is going on Monday. Can't wait to hear it. Factory, secondary cats are under the plate but can be seen when up on a lift if you peak in. Certainly could not tell they have been removed doing a visual down on the ground. I will report back on sound after I install the pipes. Ported throttle body will be soon to follow when Tony gets it to me.

01Defense

Which Borla? PN?

capevettes

Borla X-pipe 60547, fits 7 speed manual, eliminates secondary cats.

Z0Sick6

Did you notice any lose of tq or power? I read the corsa, because its 3" loses some tq. Not sure if that is actually true or not...

Mopar Jimmy

Nothing noticeable in SOP but I bet it would have been .1 tenth slower at the drag strip b/c several have found this to be the case with the 3 inch Corsa. It makes the sound both louder and deeper and sounds great, but I like drag racing and if I did it again would probably have done the Borla b/c I can't stomach a mod that makes the car slower.

01Defense

I have the A8. Thanks for the info

capevettes

I believe the 60547 fits the A8 as well. 60548 does not eliminate the secondary cats.

Z0Sick6

Absolutely. Seems like the Borla gains about 10 whp and won't cause any loss.

Z0HS1CK

Got my borla x-pipe installed yesterday.

All i gotta say is THIS is how the car should have came from the factory.

In track mode, the car is pretty loud. Cold startup, WOT, it's decently loud for a stock car.

After i got my x-pipe installed, since the car was fairly warm still after about 1.5 hours, and it was 83 degrees out, the car didn't seem that loud upon first start up.

But the first chance i got to hit it pretty good merging on the highway, i absolutely noticed the difference, as you should.

The car absolutely SCREAMS!

I wanna say it's close, but definitely not as loud as a long tube, catted x, NPP (in open) exhaust on an NA LS or LT1. It's damn near that loud. Talking about actual volume, not type of sound note btw.

Like my C6 when i first installed my long tubes with the catless xpipe and a borla exhaust, i would find myself revving higher in each gear now to hear the sound.

On the Z, i'm doing the same thing. It's slightly a different sound, more "raw". About 15% louder than stock when rowing the gears.

Cold start up about 40% louder.

Love this xpipe.

sTz

I installed the Cosa Extremes and their Double Helix X-pipe specifically for sound, and I'm 100% happy w/my decision. If any ponys were lost, I certainly did not notice. Actually, to the contrary... Either way, any comparative difference on a 650hp/650tq is negligible. Those on the fence should go to a few car shows, or other gathering, and hear for yourself as sound is subjective. If you're solely looking to add HP, then I'd look beyond an X-pipe.

01Defense

I would rather the x-pipe set up that yields the most hp,like most others here. Modding for less power, makes less sense imho. May as well leave it stock.

lordofwar

that's what you say,until you hear it.borla is the way to go,little money no codes,no downside.when you sell the car switch back to stock,sell xpipe.

sTz

Humble or not, look at the vid in post #10. Nobody said modding for less HP. I said any comparable different is negligible.

Also, why leave it stock? That's nonsensical when I said that I added the Corsa system for "sound." Removing the rearward cats increase volume and the Extremes improved the tone without incuring drone. I also added side skirts, splash guards, floor mats, etc. I doubt that I gain any HP from those mods. You're logic is that if a mod doesn't yield HP, you should leave the car stock. I disagree.

Nonetheless, the good news is that you have options.

Z0HS1CK

It's not soo much gaining more HP with the x-pipe. It's mainly for sound.

That's why i bought my xpipe, because i wanted the car to be slightly louder. If you want real HP gains, you have to get long tubes, then a tune. Then you'll see a great HP gain.

But i didn't want long tubes, yet. We'll see how the ZR1 looks, i might even trade the Z in for that.

If not, then maybe in the future i'll install long tubes on this car.

But the xpipe for the price, 400 bucks, for the sound it gives, is worth it. And you save like 15lbs too. The stock setup is pretty heavy.

Oh and the borla does in fact add hp. It is proven to add 10rwhp IIRC.

2fastnow

X pipe = single exhaust period. Nice 'tuned' single exhaust sound but still a single...period. I cut them out when I can or get to it because I like true dual exhaust sound especially with headers. Try it, you may never go back.

Al3x_666

I have the Borla X pipe catless since the beginning of the summer, since I have the Borla the rear end of the car is always dirty as ****... but the sound is nasty & addictive on rev match!!!

3 Z06ZR1

2 inch Headers and 3 inch x pipe is bigger and better than stock!
I would just go with coated Headers. I'm partial to American Racing.

I tie mine to the rear stock cat back. I like to go quiet even with headers.
I can come and go late sometimes.

The headers really tune up the exhaust sound, less heat under hood for sure and mine were good for about 35 rwhp with a full dyno tune. Then you drop a lot of weight

My car full of gas and oil and with some weight reduction with headers and in the wheels an tires weighed a very nice 3390.

650 rwhp and tied to the Halltech tric with 3390 pound should be a rocketship and it feels like one!

3 Z06ZR1

All the Corvette headers have a version of an x-pipe.
You get great sound. Doesn't sound like single exhaust!