RCSBTURBO4WD

Hey guys, I am trying to put everything together before I star the swap of my 5.3 to the new forged 370 with a 76/75 turbo.. Right now I am trying to figure out what size exhaust should I get after the turbo.. Is there certain muffler or exhaust that turbos like??
Thanks guys!
It is going in a RCSB silverado...

JAX04

iTrader: (17)

the general rule of thumb... Fit the largest downpipe you an fit, dont put it through chambered mufflers.

Chicago TDP

iTrader: (3)

Why no chambered muffler?

Chris@CBR

JAX04 is right, Mufflers like MagnaFlow, Borla, Dyno Max Ultra Flow work better on turbo systems than Flow Master or any other chambered style mufflers.

S1LV3R

iTrader: (5)

Really? I was thinking of doing mine like the old Grand Nationals. I already have 3" Flowmasters and a 3" X pipe. I was going to go from the down pipe to where the X is and tap in there. I know that the chambered mufflers don't flow like a straight through but would it be that bad?

Chicago TDP

iTrader: (3)

Ah, if there is data to back it up, I will agree then.

I have a Hooker Aerochamber 3.5" muffler on my car...but it is not really a chamber muffler per say....I can see STRAIGHT through the bastard....

97WS6SCharged

iTrader: (1)

For a street car it probably wouldn't hurt it much and you could always use a cutout to bypass the muffler. Keep in mind you can ditch the x pipe and dual exhaust with a single and just run one muffler to save weight. Also if you use a straight through it will mostly add tone since the turbo will also quiet the exhaust a bit.

As for your original question run the biggest pipe that is practical.

intenseblue

iTrader: (1)

There was a guy with a twin mustang i want to say picked up 70+ whp from flows to dynomax ultras. Several examples can be found in the 30-50 range if you search

Heavy H.P.

What type of Borla's are you guys talking about?

HexenLord

The rule is to just not get restrictive chambered mufflers. The exhaust isn't going to care what brand or part number. A quick look at Borla's website gives you a pretty good idea.

Heavy H.P.

Ok thanks

luigiandme

iTrader: (2)

Jesus, I wish flowmaster never existed.

milkplus

iTrader: (3)

I'm not a fan of the sound on an LS, but the original American Thunder exhaust on my foxbody was probably the best sounding car I've ever heard. If you didn't have that, you failed the 90's.

My zero percent scientific theory on turbo cars is since the exhaust pulses are bouncing off the turbine, it's already quieter than an NA/blower car. You can get away with a lot. If you can see straight through the muffler, it should be good to go. Diameter should be as big as you can fit under the car.... plus a 1/2 inch.

dmaxvaz

iTrader: (1)

i would at least do a 4" exhaust. 5" if you can fit it. i have a p/n for a mbrp 4" resonator. let me find it

HexenLord

You own a diesel don't you?

Honestly no point in a 5" exhaust if the turbine has a 3" outlet. It'll cost more, be harder to find clearance for, and could possibly even give poor wideband readings if your wideband is placed too close to the turbo. You likely wouldn't see any gains over a 4" either.

Old Geezer

iTrader: (3)

How else would a million Moosetangs be identified, without the classic "Blowmaster" rap????

Chicago TDP

iTrader: (3)

I hope someone puts fact and truth to exhaust systems and there diameter soon.

Is there anyone that has dyno numbers or track numbers to show any improvement from going from a 3.5" to a 4" or 4" to 5"???

allmotordustin

iTrader: (1)

Go with what ever size your turbo outlet is. If you have a 3.5" outlet there is no need to put a 4" or larger on it. Many people make gobs of power on 3" and 3.5" stuff.

HexenLord

Less pressure after the turbine means less resistance on the turbine. If you can evactuate the exhaust better once it exits the turbine, it'll help (although marginally), reduce some of the overall backpressure. Of course when you have a 3" outlet and a 4" downpipe, going to a 5" isn't going to help any more. Infact, going too large can create uneven flow in the downpipe and throw off EGT gauges and widebands.

mufflerguy

Here's a cutaway of a flowmaster (chambered) muffler. Tell me how many 90+ degree turns you see the exhaust flow having to make. This is why they don't work. Sound great? Hell yah. Flow?. No chance in hell. Inlet's at the top.