NNBS Bolt-on Performance?

[DeanH1290]

Figured I would keep all of this info here to keep it easy to find for anyone looking for the same info.

To start of, the truck has a 5.3l LC9 with the 6sp auto transmission with 3.42 gears. I'm looking to do some bolt on mods before I go forward with a tune on the truck. I currently have an airaid MIT and a K&N drop in filter. What are some of the best bang for your buck mods I should look into? Headers, exhaust, stall? I'd like to keep the mods under $1k.

 

[Khaos]

Like Eddie said in your thread....stall and a good catback along with a tune will give you a good butt dyno increase.

 

[DeanH1290]

So I know the catback exhaust will give me better flow, giving more power. But what exactly does a stall/torque converter do? What all goes into installing one?

 

[2005_Silverado]

from a launch, youll take off with the engine higher up in the power band since the converter will let the motor spin at lil higher RPM. Once you get upto speed and it locks, its acts like an oem converter...no change in cruising RPM. But once u downshift or unlock it, the rpm CAN be higher than oem, depends on how much load ur putting on it. Itll feel like youve got more power, but u really dont...ur just in a better rpm range and thus get going faster/easier.

 

[static06]

Headers, stall and gears (4.10s) make for a fun truck to drive. Of course tune

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[DeanH1290]

So a stall allows me to launch at a higher point in the powerband then? Seems like that would make a big difference, especially since this thing is a dog under 2k rpm. When searching for stalls, what would be the GM designation for my trans? Its the 6sp 4x4.

 

[Khaos]

As far as I know, you should have the 6L60E transmission.

 

[DeanH1290]

Should it say in the codes in the glove box or is there another way to know for sure? I know it has to be the 6L60E or 6L80E

 

[2005_Silverado]

if MYC, 80e

 

[Khaos]

Yeah, I don't really know much about the nnbs trucks in that sense. Just figured it would be similar to the nbs trucks like 4L60E = 6L60E etc

 

[2005_Silverado]

i dont think trokas got 6L60....iirc they got 6L80, but might be wrong here.

 

[Trevor F]

Converter is a fairly in depth install, Un bolt trans from engine/flexpate, slide it back..etc
But not a hard job at all especially if your familiar with this stuff.

 

[DeanH1290]

I'm not familiar with any of this stuff tbh. If I do a stall, I will most likely get it installed. That way the shop would be liable if anything went wrong like what happened to Jared with the g8.

Exhaust I think I could handle though since its a simple bolt on installation in most cases. On the topic of exhaust, is it going to matter too much on how nice of a system it is? I've had this one saved for a while simply due to the price.
Dynomax 39495 Stainless Steel Exhaust System https://www.amazon.com/dp/B00503PZ52/ref=cm_sw_r_awd_h.HYvbWXSFRTM

 

[static06]

Since you're 4x4,youll have to find some headers that will fit 4x4 trucks. I know calspeed you'll have hell putting them on

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[DeanH1290]

Let's talk about headers for a sec. I did quite a bit of digging on them recently and here's what I've concluded.

LT headers - best gain but they will be a bitch and a half to install, especially being 4x4

Shorty headers - cheaper, less gain, but fairly painless install since nothing really moves.

Would the shorty headers even be worth it? Do they flow that much better than stock? Don't know that I really want to do LT's since they are such a pain.

 

[Khaos]

Shorty headers are a waste of time and money. Stock flows very well. Honestly, you'er better off just doing a catback, stall, and tune. LTs would would help some, but not as much as the other stuff.

 

[DirtyBlackHoe]

Don't waste your time on Shorty headers...not worth it.

 

[DeanH1290]

What are thoughts on the catback I posted?

 

[Jake747]

Personally I'm not a fan of Dynomax. But really the topic of catbacks in general can be debated discussed for years on end with no clear cut answer. It's what you like the sound of, what lasts, what you can afford, and what doesn't hurt performance. Personally I'm a fan of Borla.

 

[roundsy]

Look into speed engineering for LT. I've heard good results with their fitment with 4x4 models. I'm going to be doing a stall over the winter and most likely a vette servo while I'm in there.