jconstan

Can you install factory NPP on a car that did not come with it? Is it a large effort? Costly?

tennblkc6

yes you can as many have done it..even me in my driveway. I went with the b&b fusions which is an aftermarket version of npp. what year is your car? you only need the mufflers and npp in a box.

FortMorganAl

Installing a system identical to the factory is not economically feasible. You would have to replace the ECM. NPP in a box is the way to go. It doesn't open and close automaticly like the factory system. You have to push a button to open and close but it gives the noise most people want.

jimmie jam

I think that Sunset Orange Creations makes a system that can be programed to open and close at specific RPM's through the DIC. Correct me if I'm wrong. BTW, I have the NPP in a box still in the box. Mine are open all the time.

vara411

08 ATOMIC-Z

To make it work like the factory NO. To use a NPP in a box controller YES.

rckt

I had mine open all the time, never used my switch. BTW, it is for sale

NHDave

I thought about doing the conversion myself, but the local Corvette shop offered to do the entire job for what it would cost me for just the parts. I decided to let him do it.
He used all GM parts with the exception of the Mild-to-Wild switch and I am very satisfied. I like the ability to control the volume myself.

FortMorganAl

If they needed a Mild-to-Wild switch (which they all do) then it isn't like the factory. The factory setup has the ECM monitoring the engine rpm and opening and closing the valves automatically based on operating conditions. Without the car being ordered from the factory with NPP, the ECM has to be changed and reprogrammed which is very expensive. Even the Sunset Orange Creations Exhaust Commander Elite only modifies the factory setup on cars already equipped with the factory NPP or equivalent.

Kingman99

Then would it be better to put in a remote cutout?

Thanks

Alan

rjr49

I have the factory setup with a M2W floor switch. I can't comment on the after market installs but the requirement for a switch isn't a big deal. Mine almost never goes off by itself. If I'm pushing it a little the valve is already open. If it's closed I'm either listening to the stereo at less than 3000 RPM, or my Wife's in the car.