383 whats the best size of exhaust?

[jigga99]

i have been thinking of getting the exhaust done but people keep saying 3'' is to big, and others saying you need it? i dont want to lose any torq, the setup is 383 412hp 700r magnaflow mufflers and a x pipe. whats on it now is 2.25

[6'9"Witha69]

2.5" will work fine. I have a 508 hp 383 running through 2.5". I have considered 3", but am not sure the benefit will payoff.

[Blown353]

What is your header configuration (primary size and collector type/size?)

[DeltaT]

And will your system be true duals? With tailpipes? Any plans to run nitrous or other power adder sometime?

I went with LT Hedman Huslers, 1 3/4" to 3" collectors, out through a true dual 3" Torque Tech system that exits behind the wheels. Flowmaster Deltaflow 50-series. Love it. It's a blown 383, though. If it wasn't blown and you have no plans for nitrous 2.5" duals should be perfect.

Jim

[jigga99]

the header is Tube Size 1.625 O.D. in.; Coll. Size 3 O.D. in.
no the engine is high compression so i wont run anything on this one.

[CarlC]

Which "X" are you going to use?

If using a Dr. Gas get the 3"in/2-1/2"out. This will make your fitment easier to deal with.

[chicane67]

Ill second the 3" in, 2.5" out.......

Or 3" to the muffler and 2.5" out of the muffler. As long as it is a NA type of induction.

[Sparky67]

the header is Tube Size 1.625 O.D. in.; Coll. Size 3 O.D. in.
no the engine is high compression so i wont run anything on this one.

High compression? That header is for a stock size motor. I run at least a 1.75 primary tube or 1.875 primary tube. Exhaust go with 2.5 inch, but get mandrel bent tubing. Cost is more, but at least the tube size stays the same.

Jeff

[jigga99]

so running 3' x, pipe to the mufflers then 2.5 to the tips is good?

[CarlC]

Yes, but the hard part is the muffler if you are running tailpipes.

I've been trying to find a really good, off-the-shelf 3"in/2.5" out 4"H x 9"W x 14-16L" muffler. They are hard to find. There are plenty of 2.5"/2.5" mufflers with sufficient flow for our needs.

Muffler shops will want to use a bushing to reduce the outlet, but that's not the way to keep the flow maximized. What I will likely do, since my "X" is 3"/3", is get a set of Flowmaster reducing cones and run them just in front of the muffler. The cones have a gradual size reduction vs. a step bushing. There's not enough room to run the cone aft of the muffler. This setup would still allow you to step up to 3"/3" should the need arise.

[Damn True]

Anyone know anything about the Flowmaster "hushpower" mufflers?

They look nice and compact and are "supposed" to be a bit quieter than the traditional flowmaster mufflers.

[alstainlessworks]

Guys

We can custom build almost any muffler size/length you need. We can also build them with 2 1/2" outlets, 3" inlets with either a straight through core or with chambered internal baffling.

Give us a call at 800-878-3635 or email us at [email protected]

Thanks
Al Noe
Stainless Works

[rocketman]

There's not much money saving going 3 to 2.5,I would just go 3inch,with some good mufflers.or get a flowmaster cat back system for it.

[Damn True]

I don't think it has anything to do with $$ for most folks. It seems to be more about packaging and for me sound. Not everyone likes wide open 3" pipes.