I guess i should have acknowledged the fact that I was on a forum looking for ways to make my tractor engine louder when I made that comment...I happen to love the sound of an old I-6 engine on a tractor, but that's just me. Almost any exhaust that dumps out before the rear bumper can drone and be extremely loud inside the vehicle. I don't have an answer as to what muffler to get, but my stock original is getting very close to falling off, so I'm hoping for a good "old man" exhaust that stays quiet when cruising but a tad bit aggressive if I put the foot into it.
I happen to love the sound of an old I-6 engine on a tractor, but that's just me. Almost any exhaust that dumps out before the rear bumper can drone and be extremely loud inside the vehicle. I don't have an answer as to what muffler to get, but my stock original is getting very close to falling off, so I'm hoping for a good "old man" exhaust that stays quiet when cruising but a tad bit aggressive if I put the foot into it.
There isn't much to it. Go to your local exhaust shop and have them install a new muffler and pipe from the cat back. That's all it's going to take to make you engine sound louder is a different muffler.
The 4.0 isn't a great sounding engine though to begin with IMHO. It tends to drone, so I would stay away from loud exhausts unless you like driver fatigue.
Don't waste your money on any of the so-called "cat-back" systems you see online. They are an absolute waste of money. They charge you $500, when an exhaust shop will build you the same setup for $200.
I suspect the weird 2-section exhaust manifold has a lot to do with the unpleasant sound of the 4.0. I went from a stock cast iron log manifold to a long tube 6-1 header on my inline 6 Datsun 280Z and it suddenly sounded sexy as hell...still not a small block Ford burble but had kind of an old European exotic sound to it like a Jaguar.
I like a little extra off idle, but I will not suffer drone, so if I find any hint in an online review that a muffler or system drones on the highway, I'm out. Per a post in this thread, I think I've eliminated the MBRP as a possibility. I seem to read good things about the Flowmaster Force-II, which uses their 60 series and is supposed to be almost stock sound level.
My worry about a local shop is I want everything replaced behind the cat and whether I can trust them to copy the factory exhaust routing close enough to not get in the way of the upper control arms or track bar throughout the range of articulation. At least with a production solution I feel like they might have put some thought into the design.
If you want your 4.0 to sound about as good as it can (plus pickup a good 20+ WHP), get a set of these:
Description Features The venerable TJ Jeeps from 1998-2006 was our most recent target for high quality headers and exhaust components. Now available is our 6 into 1 heavy duty header manufactured using USA made 304 S/S and designed with a rotational firing sequence for increased power and...americanracingheaders.com
That's a lot of bacon, but that checks almost all of my boxes: Made in USA, 303 stainless steel. I would love to know more about this. Do you have a sound clip?
Do you have any personal experience with this?
No, but I know the guy who makes them.
You'll pick up about 30 WHP with these headers and a tune. They are the real deal!
I'll be putting some on my 4.0 in the coming month or so, so stay tuned!
Golen uses these on all their stroker builds and makes tremendous gains with them.
I've avoided headers just because my one experience with them, I was fighting leaks a lot. Like the Jeep 4.0, it was on an inline six where the intake and exhaust shared bolts and a gasket so it was more PITA to fix than I will tolerate doing once a year.
...but I can't think of many other ways to pick up 30hp for $1500, so I might actually consider that if my low compression in adjacent cylinders turns out to be a head gasket.