Then how does the NPP add 6 hp on the Corvette? Are you saying that the regular exhaust on the Camaro is more efficient than the regular exhaust on the Corvette?

This is completely false! No gains if your car is bone stock, and in the case of the 1le probably no gain. But add some mods and the exhaust will come into play! The stock exhaust is NOT perfect, it has some ruff bends but on a stock car it works. Once you mod the idea that the stock exhaust will make the same power as aftermarket or custom setup is no longer true!

Might be.

I've owned both -- from my experience, the stock C6 exhaust is more quiet than the stock C5 Camaro exhaust. Visit the C6 (Corvette) forum and read all the complaints about how dead quiet the C6 exhaust is.

You just contradicted yourself buddy.

On a pure bolt on car (intake, TB, lt headers, tune) it has been shown and proved that replacing the stock catback with an aftermarket catback on the Camaro gives no gains.

Tose bad bends dont seem as importantant because the exhaust is moving differently n the large diameter pipe co pared to the narrow diameter of the header primaries. The mufflers on the LS3 are designed like most typical absorption style mufflers with perforated tube. I have not seen a cut away of the corvette muffler to compare to the SS.

This is new to me. Where has this has been shown? If an exhaust company claims that their system for the Camaro gains an average increase of up to 6HP and 7ft-lbs. of torque, are you saying that they are making false claims? Not sure if I'm understanding correctly.

The stock exhaust does not restrict flow or performance until you get up to around 680rwhp. This was documented by Ted of JRE about 3 years ago if you care to search back that far.

SOooo... if you buy an aftermarker catback, axleback or get the optional NPP exhuast, do it for the sound. That's all that is going to change.

Aftermarket manufacturers have reported BS gains ever since the first aftermarket was released.

This thread is awesome!! lol :laugh:

This is total bullcrap! A 3" X pipe exhuast will make power over the stock exhaust in propbably even a mild bolton car. Explain why my car picked up 2mph with nothing but swaping 1 chamber flowmasters to 3" glasspacks! Dont bother saying weather, because it was in simular conditions and I noticed an increas in performance right away! Plain and simple, they flow better... the stock exhaust is not going to match a good aftermarket systeme, I dont care what test say.

Lol

All that matters is what happens at the track...and every car is different. Dont go by what dyno test on one car show and take it as fact. Its just idea of what the out come could be on your car, thats why cars with the same parts will respond different. I just talked with a guy not long ago who picked up 15 at the wheels with his cutouts open, he was running the stock cat back with aftermarket mufflers. This was in a cammed car... so according to you, this car would not see a gain by switching out the stock exhaust to a full 3" aftermarket setup :sm0:

GM just didn't choose to update their performance specs for the 1LE from the standard SS. Likely due to the fact that 1LE is performance option on an SS rather than a separate model.

There should be no question that 1LE options will increase power and enchance performance over a base SS.

I just love how some around here say 6 HP is no big deal and you will never feel it. Granted I would not feel it, but if you add a CAI and VMAX TB each of those add a little but when you add them up they mean maybe 20-25 more HP and Torque to the back wheels.

In my mind every litte gain is worth trying to get and gets you closer to a 5.0 off the line.