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I have a 94 IDI turbo,I have a full 3" exhaust with no muffler,it sounds good until higher rpm then it starts to sound like a glass pack,I hate that sound,if I use a 4" complete from downpipe back will that go away? It seems that with a 3" DP and the rest 3" it may still be restricted,any advice?

 

[93turbo'd_animal]

the larger the exhaust the deeper the note will be so it may take away some of that glass pack rapity

 

[turboveggierob]

I have 3.5" exhaust from the turbo back with no muffler, the crackling at high RPM is deep and sounds good, not too high pitched like I have heard on some other trucks.

-Rob

 

[FULL FORCE]

[ QUOTE ]
I have 3.5" exhaust from the turbo back with no muffler, the crackling at high RPM is deep and sounds good, not too high pitched like I have heard on some other trucks.

-Rob

[/ QUOTE ]
I have a take off 2000 PSD exhaust here,it is 3.5" I may remove the muffler and try it before I buy a 4" exhaust.

 

[Squid63]

I've got 4" from the downpipe back, but I've still got to replace the stock downpipe (I know...) I get the glass pack sound around 2500, which is a little better than before the 4". I would have to think that a larger downpipe would cut it down some more.

 

[twelve0six]

I think you are stuck with the sound...it wouldnt matter if you had a 10" stove pipe off of a Peterbilt...you could kill it off by adding a performance muffler. I think that the ~5.5' of straight section is what causes it...it builds a harmonic vibration in the exhaust frequency itself, and leaves the pipe as a chopped up reverberation....If you put a straight through type hypermax muffler(the kind that looks like it has chain link fence inside) in the middle of that long straight section, I think that it would disrupt that exhaust reverberation enough to smooth the sound out...Personally, I dont mind the cackle...I still get cackle with my exhaust system listed in my signature.

Shawn

 

[Jason R]

After I straight piped my all stock exhaust, I wasn't that thrilled with the snappy cackle I got just above 2000 rpm, so I cut the tip at an angle towards the rear of the truck. Sort of a rounded 45 degree angle. Believe it or not it did make a bit of a difference. The snappy cackle was now not as sharp as it had been and it started at a higher rpm.