Originally posted by NPloysa
Forrest, do you not like your 5" as well as you thought you would? I may be getting a 5" system, so tell me why you should have went with the 4"!
Thank you,
Nick
Nick,
I've always liked the sound of a straight piped Cummins... on my '92, I had 3" exhaust with a 4" tip... sounded great... a little loud on the highway, but not TOO bad...
I LOVE the way the later trucks sound with the stock system with straight pipe...
I also love the way a big 5" tailpipe looks, so I went 5"...
I had 4" exhaust into dual 5" stacks, and the resonance at 2500 RPM with the 5" straight system under the truck was EAR SPLITTING!!!! MUCH worse than the stacks!!

I lined the interior with lead sheet which helped A LOT!!
I loved the way it sounded straight piped, and the HX40 sounded SICK through the tailpipe!
but on the highway, it was still a little annoying from ~2300 on up, and 2500 was pretty bad...
so I put a 12" long 4" diameter Dynomax bullet muffler on the downpipe about 3" from the turbo. it sounds great, but I miss my straight pipe sound...
I'm thinking/wondering if a straight 4" system would have had a little "tighter" sound and not have resonated so bad... who knows?
all I know is I've been seriously thinking about stacking the truck again! LOL! I'm thinking that with the lead lined interior, it might not be so bad, and if it gets a little hairy, I can put the bullet under the truck for long trips.
I've actually been thinking about a single stack... I could set up different stacks/mufflers and it would only take a couple seconds to swap them out depending on what mood I was in that day.
Forrest