I agree about the borla stuff, never seen a bad one yet. Like I said earlier it concerns me that GM doesn't list it for the 6.0, methinks they know something and I would hate to waste 700 bux figureing it out.

Money is a concern, but like another member replied, money wasted is just that, better to do it right the first time.

I'm going to do a bit more digging on the size of the pipe, etc.

Thanks for all the replys, lets keep this going.

Tony

 

I think it has more to do with gm just don't realize that they put the same ehxuast system on every truck/suv combo with pipe length being the only difference. Engine size makes no difference other than the dmax trucks in gm exhaust systems.

 

The 6.0 trucks have an extra little muffler/resonator just before the end. Makes a guy wonder what the deal is. Some of the higher end exhausts list a specific system for the 6.0s but the magnaflows, etc just list one for the 4.8 5.3 and 6.0.

I'm problably just bieng paranoid about this whole deal, but I'm cheap and hate to waste money, lol.

I was hoping someone else had been the guinea pig on this NNBS exhaust question.

Tony

 

I put exhaust on my truck first then headers/cats.
Magnaflow single 3" s/s cat back. Sounded perfect, louder than stock for a daily driver, quiet on the highway and a nice deep smooth sound when you had your foot in it.
When running in 4mode, you could hear a change in the sound but not annoying, no resonance at any rpm.
Only trouble with M/flow is that the tubing for the pipes is 409 ss not 304 so it
discolors and gets dark quickly.

After installing the headers, the sound is much louder and the 4mode is loud and
somewhat annoying. It is loud at idle and sounds like it has a cam. The sound is very crisp and clean, truck runs like an ape too. It is a bit loud for my taste with the headers.
You will also get a code for the rear 02, convertor efficency below threshold.
Y-pipe didn't fit very well, banged on the tranny xmember, I actually took the xmember down and cut a channel in it rather than dimple the pipe and cause a restriction,
I told dynatech about the fit issue, they may have it fixed, mine was one of the first sets.

Tony, did you get any vibration in your truck when you dynoed. I tried to do mine awhile back but had a vibration above 4000rpm and I couldn't tell if it was tires or the monster
driveshaft so I stopped before getting any real numbers.

 

Thanks for the reply.

I have thought about the magnaflow just based on price alone it makes the most sense, everything else is just rediclous. I am installing a GMPP touring exhaust on a 5.3 truck monday, so I will get a first hand look at it on someone elses dime. Hopefully it helps me out deciding.

I would really like to get the dynatechs, would be nice to see 400 rwhp naturally aspirated, lol. Sounds like it's cammed huh? That makes me want them more. No worries on the rear o2/cat code, have the hp tuners to fix that.

To answer your question, no notable vibration on mine on the dyno. Just your usual bit of tire hop at low speeds. My truck is also lowered, removed the factory lift block and installed some 2 inch shackles.

You'll also be happy to know that your old blower is alive and well on a freinds 2005 sierra denali 6.0 truck. Brings a smile to his face every day.

Nolan found quite a bit of power in mine on the dyno, learned some things that should be able to help you out with your truck as well.

Tony

 

Ya, you need to get your exhaust and headers done so Nolan can finish the tune..lol
He sent me an update last week but I was in Cuba and haven't installed it yet.

I am going to try and dyno again after I get my d/shaft balanced and put my summer rims/tires back on and re-balance those as well. My truck is lowered front and rear so it shouldn't be a pinion angle deal.
400 n/a would be cool. If you got to 350 stock with a tune, 400 shouldn't be out of the question with headers and cat back.
Glad your bud is enjoying the Radix, I know me and my tranny did

Dave

 

I'm working on exhaust and headers, just trying to get someone else to either foot or share the bill.

We actually got to 370/360 after the tune and air intake. Have to go weigh this thing one day and then off to the track when it opens.

Tony

 

This guy has gone through the same school of hard knocks that I went through as far as exhaust goes. For what your needs are, the Corsa is the best bet. There is nothing worse than spending $200 - $500 on an exhaust that someone you don't even know says its great on his truck and as you drive away from the exhaust shop, it sounds cool until 20 minutes later you can't hear your radio or carry on a conversation with your passenger without turning down the radio - or at cruise the droning drives you nuts.

I had a Corsa sport on my last truck and totally rocked. You don't hear it at cruise, but when you put your foot into it you'll hear it roar without being annoyed. You'll love going thru underpasses and dropping it into passing gear.

Do the Corsa and you will be completely satisfied. If you do a lot of towing go with the Touring. It sounds just as good as the Sport but just a little quieter under load.

 

tony, thought about one of these..


http://www.w2wpowertrain.com/pc-122-...r-systems.aspx

 

had a generic turbo muffler on my NNBS originally, replaced it with the "chokemaster 40 series" the other day. what an improvement, in terms of sound. i have had a 500+ bhp h/c TBSS, modified 05 GTO, modified SSS, with every type of exhuast, except flowmaster street series mufflers, from corsa to borla to flowmaster 10 series on these specified vehicles with differing opinions (corsa of course comes highly recommened). i will tell you this, in respect to a non-drag racer NNBS truck - the 40 sounds amazing. droan is nil, to the contrary it sounds damn well near stock in the truck at all crusing speeds, but excellent at WOT. i have always subscribed to the "flowmaster normal series street mufflers are the bane of real ET's to all drag racers" mentality, but i have altered that mindset. of course, when i add LT's, a tiny cam and some juice, the noise will increase, but i am confident that it will sound satisfactory, and produce worthy gains withstanding the "slowmaster". i went into the 40 series very sceptical, but i couldnt be happier...for the moment. just my humble opinion, and of course, i dont deal with the 4-cyl. mode.

todd