Help with exhaust

[XfireZ51]

Originally Posted by Bolling

How do I tell and what are the differences? I have read where they drone quite a bit but these do not seem to drone. You can hear them at 60 or 70 but it's not a drone. I had a C6 vette with NPP and they would drone in the open position at driving speeds so I always closed them on the highway.

I have NPP on my ZR.

[Bolling]

Originally Posted by XfireZ51

I have NPP on my ZR.

That is really cool, that's the main thing I miss from the C6.

[XfireZ51]

Originally Posted by Bolling

That is really cool, that's the main thing I miss from the C6.

It's an FBI innovation. mike100 has added his own little spin on it w rpm and manifold pressure control. I'm using a console mounted On/Off switch.

[Bolling]

Originally Posted by XfireZ51

It's an FBI innovation. mike100 has added his own little spin on it w rpm and manifold pressure control. I'm using a console mounted On/Off switch.

Are you using Z06 mufflers, tell me a little more about the set up.

[-=Jeff=-]

I will let Dom explain his set-up but most the guys here have the NPP Valves with slightly different pieces:

One guy has a B&B with a Stainless Works X-pipe and NPP With B&B Mufflers/tips..

Another is B&B 3" pipes, Custom resonator/ X-pipe with Dynomax mufflers with NPP and Z06 tips

Now I know most search out the Z06 muffflers and use the tips/valves, but I have seen the valves on eBay for about $100 each

I am the black sheep of the FBI group.. motor is still mostly stock and I am using Corsa. I have no drone at all.

Now, drone is very subject and depends on the person. Dom's car still has some drone ( to my ears) but not nearly as bad as without the NPP Valves. My ears are quite sensitive (genetics unfortunately) so for me the Corsa fits the bill and I think if you heard Dom's or any of the others here it would help you decide if that is the way you want to go

[XfireZ51]

Originally Posted by Bolling

Are you using Z06 mufflers, tell me a little more about the set up.

What's done is to graft the Z06 NPP tips to a dual outlet muffler. Some have used B+B mufflers. ALZR1 does the cutting and welding at Brakes Plus. Some others, like myself and BobG's 427 have used DynoMax UltraFlow muffs because they are true 3" inlet muffs. The vacuum is supplied from the plenum through the stock charcoal canister hose system running down the passenger side to the right rear corner. I have a check valve and solenoid in line to control vacuum flow.

Edit: as Jeff said, my system is made up of Watson 1 7/8" headers, Stainless Works Xpipe,
using 3" SS pipe and dumping into the aforementioned mufflers. I typically ride around w the valves closed. I flip a switch to open them up for performance reasons.

[Bolling]

Originally Posted by XfireZ51

What's done is to graft the Z06 NPP tips to a dual outlet muffler. Some have used B+B mufflers. ALZR1 does the cutting and welding at Brakes Plus. Some others, like myself and BobG's 427 have used DynoMax UltraFlow muffs because they are true 3" inlet muffs. The vacuum is supplied from the plenum through the stock charcoal canister hose system running down the passenger side to the right rear corner. I have a check valve and solenoid in line to control vacuum flow.

Edit: as Jeff said, my system is made up of Watson 1 7/8" headers, Stainless Works Xpipe,
using 3" SS pipe and dumping into the aforementioned mufflers. I typically ride around w the valves closed. I flip a switch to open them up for performance reasons.

That us really neat. I already have the B&B 3" so now I just need to find some tips.

[mike100]

My first time around with this modification, I used C6 muffler parts -the entire tip and vacuum actuated exhaust flapper.

If I ever do another one, I would try to get the same type of valve used on newer BMW's. Quite a few models have them now. They are a better valve since they don't rattle. A lot of the used C6 NPP mufflers you find for sale are warranty repaired C6 units that were swapped out at the dealership due to noise (so buyer beware). Also don't forget the entire exhaust systems expands when it gets up to operating temp so make sure to leave room for that. mounting the valve to the side is the safest bet.

[Top Toy]

In a few weeks I will have a set of B&B Fusion (dual mode) mufflers complete with solenoid valve and key fob wireless remote available for sale. One of the mufflers has an internal rattle that could be fixed by someone with access to a good TIG welder. The other muffler has been cut around the back face in an attempt to find a rattle in it. (And, no, it's not the valves rattling.) The tips are traditional B&B oblong shape but double wall, sharp trailing edge. Everything is polished. Very sharp looking! If someone is interested in either repairing the mufflers or using the tips, valves, wireless set-up, let me know and I'll send pics and a price. Switching to Stainless Works Turbo S-Tube mufflers.

[XfireZ51]

Dennis,

U coming to BG this year?