[Need4Camaro]

I'm thinking of purchasing a system for my 2SS, but not sure what to aim for. The car has NPP and I want to leave the NPP functional.

If I upgrade the headers, cats, and X-Pipe but kept the stock NPP mufflers, how much power would I be sacrificing?

What is the most ideal way of tackling the entire exhaust for a car with NPP?

[ste6000]

Originally Posted by Need4Camaro

I'm thinking of purchasing a system for my 2SS, but not sure what to aim for. The car has NPP and I want to leave the NPP functional.

If I upgrade the headers, cats, and X-Pipe but kept the stock NPP mufflers, how much power would I be sacrificing?

What is the most ideal way of tackling the entire exhaust for a car with NPP?

you can always buy setups that include NPP. that is what i did. I havent done headers yet. im on the fence about them. If you get headers you will need to tune your car and such and tuner will kiss your powertrain warranty goodbye. Most all companies have NPP version exhaust. outside that i'd try to listen to them on youtube to see what sounds good. i got the Borla ATAK with the Borla X pipes.

[arpad_m]

There isn't any power to be gained from an exhaust unless you are making crazy high numbers.

Out of the "big three" vendors of drone-free, good looking and sounding exhausts, AWE is out because they aren't willing to make valved models, choose Borla for a nice low, non-raspy rumble or Corsa for a classic, more brutal muscle car sound.

I'm sure there are others that work and are cheaper, but I personally don't want to mess with resonators and J-pipes to eliminate drone or fine tune the exhaust after spending a ton of money.

I for one like the stock NPP even with headers, but one of these days (when I can justify the cost somehow) I'll get me a nice Corsa catback setup.

[LT1ornothing]

OP, Your stock NPP catback has been tested up to 900 rwhp before becoming a restriction. The biggest restriction in the factory exhaust system are the primary catalytic converters and the tiny pipe connecting your factory tri-Y exhaust manifolds to them. After this, the next biggest restriction is your secondary catalytic converters.

If you want to save money and have a 900+ rwhp capable exhaust while retaining NPP functionality, buy and install 2 inch catless long tube headers and have that connected to your factory NPP catback.

[Need4Camaro]

If thats the case, is it even worth doing headers on these cars?

[Joshinator99]

Originally Posted by Need4Camaro

If thats the case, is it even worth doing headers on these cars?

Depends on the build and desired HP level. I found the stock manifolds to be fine and didn’t find them to be a restriction until I went past ~650 WHP or so. And even then, it was the primary cats that were really becoming an issue at that point.

[Need4Camaro]

Originally Posted by Joshinator99

Depends on the build and desired HP level. I found the stock manifolds to be fine and didn’t find them to be a restriction until I went past ~650 WHP or so. And even then, it was the primary cats that were really becoming an issue at that point.

I guess in that case it’s safe to say the stock exhaust is okay until 650 whp?

If that’s the case, where is there power to be had? If I did do full exhaust and a tune to go with it, along with CAI and a Intake Manifold, would I see worthy improvements? It’s really sounding like the SS is almost maxed out in stock form without getting into the internals.

Im out of the loop when it comes to modding 6th Gens. I haven’t been paying much attention because I wasn’t going to touch anything until I paid off my SS but some strain of rare luck happened and I managed to pay it off a few years early.

[LT1ornothing]

Originally Posted by Need4Camaro

I guess in that case it’s safe to say the stock exhaust is okay until 650 whp?

If that’s the case, where is there power to be had? If I did do full exhaust and a tune to go with it, along with CAI and a Intake Manifold, would I see worthy improvements? It’s really sounding like the SS is almost maxed out in stock form without getting into the internals.

Im out of the loop when it comes to modding 6th Gens. I haven’t been paying much attention because I wasn’t going to touch anything until I paid off my SS but some strain of rare luck happened and I managed to pay it off a few years early.

There is a lot of power to be found with FBO. For example: E85, 2 inch catless longtube headers, msd intake manifold, Nick Williams 103mm throttle body and an OTR (over the radiator) cold air intake set ups tuned have been known to put down near 500 rwhp. That is a 100 rwhp improvement over stock. Not exactly anywhere near maxed out in stock form without getting into the internals. And a hell of a lot more than any other naturally aspirated engine out there.

Now if you want more than that, your choices are to either open it up for cam, valvetrain upgrade, and ported heads OR put a better fuel system in it (such as LT4) and slap a blower kit on it.

[Need4Camaro]

Originally Posted by 1LEornothing

There is a lot of power to be found with FBO. For example: E85, 2 inch catless longtube headers, msd intake manifold, Nick Williams 103mm throttle body and an OTR (over the radiator) cold air intake set ups tuned have been known to put down near 500 rwhp. That is a 100 rwhp improvement over stock. Not exactly anywhere near maxed out in stock form without getting into the internals. And a hell of a lot more than any other naturally aspirated engine out there.

Now if you want more than that, your choices are to either open it up for cam, valvetrain upgrade, and ported heads OR put a better fuel system in it (such as LT4) and slap a blower kit on it.

I’ve hear the fuel system stock will handle a modest amount of power but when it comes time to upgrade, it gets very expensive. Is this also the case for the LT4 fuel system?

[LT1ornothing]

Originally Posted by Need4Camaro

I’ve hear the fuel system stock will handle a modest amount of power but when it comes time to upgrade, it gets very expensive. Is this also the case for the LT4 fuel system?

The LT1 fuel system is more than capable of handling just about any naturally aspirated modifications. Fuel demands increase much more for forced induction applications and the stock LT1 fuel system can not keep up with the fuel demands for a blower or turbo. The LT4 fuel system allows the LT1 to safely provide enough fuel for low boost. Beyond that, you either need a cam upgrade with a bigger fuel lobe OR a high capacity Direct injection system upgrade OR install a complementary port injection fuel system.

[ST1LE]

Originally Posted by Need4Camaro

If thats the case, is it even worth doing headers on these cars?

An SS with headers and a tune is a completely different animal from a stock SS.

To me, headers and a tune are a must have on any of my muscle cars.

The muffler choice is mostly subjective based on what you like. The stock NPP isnt bad, but raspier than I prefer.

I will likely go with Borla S-Type axle-back on my car, but again just because I prefer the cleaner, deeper sound.

[xplct]

Originally Posted by ste6000

you can always buy setups that include NPP. that is what i did. I havent done headers yet. im on the fence about them. If you get headers you will need to tune your car and such and tuner will kiss your powertrain warranty goodbye. Most all companies have NPP version exhaust. outside that i'd try to listen to them on youtube to see what sounds good. i got the Borla ATAK with the Borla X pipes.


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I’ve heard this system and I think it sounds the best out there. Love the black tips also! I would love to put this on mine in the future.

[Crushin_LT1]

I went with the Corsa NPP system, has the muscle car sound I was looking for while not being obnoxious or overly raspy

[Need4Camaro]

Originally Posted by Crushin_LT1

I went with the Corsa NPP system, has the muscle car sound I was looking for while not being obnoxious or overly raspy

Did you notice any difference in power?