Hey guys,
Currently my 89 d250 w/ 318 has a 2" y pipe off of each stock header, into a single exhaust through 1 muffler and out. Its pieced together and has a few too many clamps and needs replacement.
The Y pipe is fairly new and I wanted some ideas on what to put behind that. I was thinking of coming off the Y into a 2 1/2" pipe, through a thrush welded muffler and out.
Is 2 1/2" good for that set up or should I go 3", or something entirely different?
Thanks

 

Exactly what I'm running I have it coming out right before the tire.

 

And are you happy with the sound? I didnt want anything too annoying as far as loudness goes.

 

It's not too bad it seems louder in the cab than it is outside, but when you step on it everyone will know you're there

 

If you're going to have the exhaust off anyway why not scrap the y and run new pipe out for a dual exh?

 

i don't think it is possible to run dual exhaust on a lot of these trucks because of where the gas tank sits

 

Well. I have the exact same truck. I have the factory 2 inch y-pipe into the cat, about a foot of pipe, and then a thrush 28 inch glasspack. I think the 3/4 ton models have enough ground clearance that you could probably run some low hanging duals. For me, a single 2.5 pipe is fine. I think that 3 inch would be ok too. But if I was running true duals, I'd go with 2.5 for sure.

As far as sound, my current setup sounds really weak. My truck actually sounded pretty quiet with no muffler. A lot of guys around here run flowmasters way louder than my truck with no muffler. I don't know if its the cat or something, but my truck is weak, even with a glasspack. It does open up though if I really pound on it, and it does surprisingly feel a bit more responsive, and way better on the highway. Previously, I had a flowtech single in - dual out muffler exiting right before the rear axle. That sounded ok too, but I changed it out in hopes of getting more volume from the glasspack.

 

Don't glasspacks sound kind of tinny though?

 

When I got the truck about 4 years ago it had true duals on it, both exiting to the rear of the pass. rear tire. It also had a hallowed out cat on it.
As pieces rusted out and I tried to piece things together it ended up with a new 2" Y pipe into a single 2" exhaust.
So anyhow I dont want anything too loud, but a little rumbe over stock would be nice.
As for loud without muffler, when my exhaust blew out through rust several times before the muffler it was way way too loud. Im talking embarrasing loud!

 

That's like when I got mine, the guy who I got it from said it had a small exhaust leak. I looked under the truck to find nothing from the y pipe back haha. It sounded like a monster just at idle.