6.2 diesel exhaust

[trailblazr81]

Im looking at getting a diesel blazer. Miss my old gas one but Im thinking of going oil burner. What do you people run on a N/A diesel Blazer? Would a 2 chamber work/sound ok on a diesel? I would think that something straight through would be best, but whats good and cheap? Jegs and Summit have knock off 2 chamber mufflers for $30 and glasspacks are always cheap. Just dont want to sound like @ss. Also what size pipes? Havent found cheap headers for a diesel so I guess I would just go with stock manifolds.

 

[BKinzey]

2.25" for duals, 3" for a single. Glass packs fill with soot and are not recommended.

Can you run a straight pipe in CA? I'm fairly certain you aren't supposed to.

 

[trailblazr81]

Theres alot of things yer not supposed to do in Cali. but that nerver stopped me. (shh) I would think straight pipe would be a little too loud. The neighbors wouldnt appreciate it at 6 AM.

 

[dyeager535]

Why would you want to change it? I can't even remember what they sound like, but they are all duals AFAIK already, and very stout at that.

 

[trailblazr81]

Well just wanting to help the flow, decrease backpressure. My 98 K2500 with 6.5 TD now has a 4" exhaust with straight through muffler. I know the 6.2 N/A wont need that much, but just helping it breathe easier.

 

[dyeager535]

6.2 is so anemic to start with, wondering if any of our diesel guys have any comments on that? I'd be real surprised if an exhaust made a real difference on a stock 6.2. Although at the time, 3"+ pipe certainly wasn't common for automotive exhaust...

 

[MaxPF]

Well, C-code 6.2's are anemic because they only make 130HP and the vehicles they come in have 3.42 or taller gears. Stick bigger tires on and things get even worse.

A decent exhaust will help other mods work to their full potential. I would stick with a single 3" or 3.5" exhaust, preferably run down the passenger side. It will flow as well as a pair of 2.5"s, you only have to buy one muffler, and it will be in place and ready if you decide to turbo it

GM produced NA J-code 6.2's with power ratings of up to 165HP (I know because I have one ). The main differences between it and a C-code are the intake manifold (all J-code intakes are not the same, BTW - there is a divided and an undivided version, and the 165HP 6.2's and al 6.5's have undivided intakes AFAIK), the prechambers (3-dot @ cups in the 165HP 6.2 - NA 6.5 cups should be comparable), and the pump calibration. Turn up the pump a bit (and have an EGT gauge that you watch like a hawk) and you can probably get that combo up to around 175HP with acceptable levels of smoke.

 

[ssped]

I am running dual Glass Packs and it sounds really great on a 6.2 It is a little louder after they break in but I like it and noone sweats it here. No louder than the flowmasters on the Galaxie 500. I love the way that 6.2 engine sounds.

 

[muddybuddy]

i used to have glass packs on a 6.2, and it did sound good. but glass packs will fill with soot as mentioned before

 

[cegusman]

I run 2.25" duals to 40 series flowmasters. sound good.

 

[6.2Blazer]

The 6.2, in regards to sound, responds the same as a gas motor. I've had dual exhaust (factory style) with 2.25" glass packs and some sort of "turbo" muffler, and now a pair of 2.5" 40-series Flowmasters. They all sounded good and always got comments from other people, most stating that it didn't even sound like a diesel until you got close enough to hear the motor clacking.

I will say the 40-series Flows were substantially louder inside the cab versus the previous turbo mufflers, but this was also a trailrig with a stripped down interior and no pipes after the mufflers. I did finally put about an 18" tailpipe and turndown after the mufflers and it helped a bunch.